Clean up a trivial commandline memory leak that shows up in the valgrind run of test_shell_tests. Fixes following valgrind warning:
Clean up a trivial commandline memory leak that shows up in the valgrind run of test_shell_tests.
Fixes following valgrind warning:

380 bytes in 9 blocks are possibly lost in loss record 331 of 423
   at operator new(unsigned int) vg_replace_malloc.c:230
   by std::string::_Rep::_S_create(unsigned int, unsigned int, std::allocator<char> const&) (in libstdc++.so.6.0.9)
   by (within libstdc++.so.6.0.9)
   by std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> const&) (in libstdc++.so.6.0.9)
   by CommandLine::CommandLine(int, char const* const*) src/base/command_line.cc:96
   by CommandLine::Init(int, char const* const*) src/base/command_line.cc:177
   by main src/webkit/tools/test_shell/run_all_tests.cc:57


Review URL: http://codereview.chromium.org/45041

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@12429 0039d316-1c4b-4281-b951-d872f2087c98

krieger-od/nwjs_chromium.src,junmin-zhu/chromium-rivertrail,pozdnyakov/chromium-crosswalk,ltilve/chromium,markYoungH/chromium.src,ChromiumWebApps/chromium,Just-D/chromium-1,mogoweb/chromium-crosswalk,pozdnyakov/chromium-crosswalk,patrickm/chromium.src,TheTypoMaster/chromium-crosswalk,chuan9/chromium-crosswalk,ltilve/chromium,keishi/chromium,rogerwang/chromium,fujunwei/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,rogerwang/chromium,timopulkkinen/BubbleFish,TheTypoMaster/chromium-crosswalk,fujunwei/chromium-crosswalk,pozdnyakov/chromium-crosswalk,markYoungH/chromium.src,dednal/chromium.src,keishi/chromium,littlstar/chromium.src,chuan9/chromium-crosswalk,robclark/chromium,markYoungH/chromium.src,dednal/chromium.src,chuan9/chromium-crosswalk,nacl-webkit/chrome_deps,ondra-novak/chromium.src,ltilve/chromium,dushu1203/chromium.src,mogoweb/chromium-crosswalk,pozdnyakov/chromium-crosswalk,M4sse/chromium.src,ChromiumWebApps/chromium,keishi/chromium,Chilledheart/chromium,markYoungH/chromium.src,Chilledheart/chromium,Just-D/chromium-1,bright-sparks/chromium-spacewalk,hgl888/chromium-crosswalk-efl,timopulkkinen/BubbleFish,robclark/chromium,nacl-webkit/chrome_deps,PeterWangIntel/chromium-crosswalk,axinging/chromium-crosswalk,mogoweb/chromium-crosswalk,Just-D/chromium-1,jaruba/chromium.src,timopulkkinen/BubbleFish,keishi/chromium,anirudhSK/chromium,patrickm/chromium.src,M4sse/chromium.src,jaruba/chromium.src,pozdnyakov/chromium-crosswalk,markYoungH/chromium.src,Just-D/chromium-1,keishi/chromium,zcbenz/cefode-chromium,anirudhSK/chromium,jaruba/chromium.src,dednal/chromium.src,krieger-od/nwjs_chromium.src,axinging/chromium-crosswalk,junmin-zhu/chromium-rivertrail,patrickm/chromium.src,junmin-zhu/chromium-rivertrail,junmin-zhu/chromium-rivertrail,chuan9/chromium-crosswalk,hgl888/chromium-crosswalk,robclark/chromium,markYoungH/chromium.src,mohamed--abdel-maksoud/chromium.src,krieger-od/nwjs_chromium.src,dushu1203/chromium.src,ChromiumWebApps/chromium,krieger-od/nwjs_chromium.src,bright-sparks/chromium-spacewalk,chuan9/chromium-crosswalk,krieger-od/nwjs_chromium.src,dednal/chromium.src,Jonekee/chromium.src,junmin-zhu/chromium-rivertrail,hujiajie/pa-chromium,M4sse/chromium.src,Chilledheart/chromium,TheTypoMaster/chromium-crosswalk,ltilve/chromium,bright-sparks/chromium-spacewalk,jaruba/chromium.src,anirudhSK/chromium,dushu1203/chromium.src,nacl-webkit/chrome_deps,markYoungH/chromium.src,TheTypoMaster/chromium-crosswalk,mogoweb/chromium-crosswalk,littlstar/chromium.src,Pluto-tv/chromium-crosswalk,timopulkkinen/BubbleFish,ChromiumWebApps/chromium,robclark/chromium,fujunwei/chromium-crosswalk,Pluto-tv/chromium-crosswalk,anirudhSK/chromium,Just-D/chromium-1,crosswalk-project/chromium-crosswalk-efl,mogoweb/chromium-crosswalk,junmin-zhu/chromium-rivertrail,rogerwang/chromium,fujunwei/chromium-crosswalk,jaruba/chromium.src,junmin-zhu/chromium-rivertrail,nacl-webkit/chrome_deps,chuan9/chromium-crosswalk,mogoweb/chromium-crosswalk,keishi/chromium,mohamed--abdel-maksoud/chromium.src,hgl888/chromium-crosswalk-efl,hgl888/chromium-crosswalk,mogoweb/chromium-crosswalk,nacl-webkit/chrome_deps,ondra-novak/chromium.src,Chilledheart/chromium,hujiajie/pa-chromium,pozdnyakov/chromium-crosswalk,ondra-novak/chromium.src,dushu1203/chromium.src,jaruba/chromium.src,pozdnyakov/chromium-crosswalk,PeterWangIntel/chromium-crosswalk,Jonekee/chromium.src,crosswalk-project/chromium-crosswalk-efl,PeterWangIntel/chromium-crosswalk,Chilledheart/chromium,hujiajie/pa-chromium,axinging/chromium-crosswalk,timopulkkinen/BubbleFish,Pluto-tv/chromium-crosswalk,PeterWangIntel/chromium-crosswalk,dushu1203/chromium.src,jaruba/chromium.src,zcbenz/cefode-chromium,Jonekee/chromium.src,hgl888/chromium-crosswalk-efl,hgl888/chromium-crosswalk,dednal/chromium.src,mohamed--abdel-maksoud/chromium.src,ltilve/chromium,robclark/chromium,ChromiumWebApps/chromium,zcbenz/cefode-chromium,PeterWangIntel/chromium-crosswalk,hujiajie/pa-chromium,markYoungH/chromium.src,bright-sparks/chromium-spacewalk,fujunwei/chromium-crosswalk,Chilledheart/chromium,mohamed--abdel-maksoud/chromium.src,littlstar/chromium.src,jaruba/chromium.src,zcbenz/cefode-chromium,ltilve/chromium,hujiajie/pa-chromium,Fireblend/chromium-crosswalk,Pluto-tv/chromium-crosswalk,krieger-od/nwjs_chromium.src,Fireblend/chromium-crosswalk,hgl888/chromium-crosswalk-efl,patrickm/chromium.src,robclark/chromium,jaruba/chromium.src,Fireblend/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,dednal/chromium.src,M4sse/chromium.src,Just-D/chromium-1,patrickm/chromium.src,pozdnyakov/chromium-crosswalk,littlstar/chromium.src,hgl888/chromium-crosswalk-efl,keishi/chromium,chuan9/chromium-crosswalk,hgl888/chromium-crosswalk,dushu1203/chromium.src,mohamed--abdel-maksoud/chromium.src,Just-D/chromium-1,hgl888/chromium-crosswalk,PeterWangIntel/chromium-crosswalk,Pluto-tv/chromium-crosswalk,robclark/chromium,PeterWangIntel/chromium-crosswalk,mogoweb/chromium-crosswalk,krieger-od/nwjs_chromium.src,M4sse/chromium.src,hgl888/chromium-crosswalk-efl,mohamed--abdel-maksoud/chromium.src,junmin-zhu/chromium-rivertrail,bright-sparks/chromium-spacewalk,nacl-webkit/chrome_deps,littlstar/chromium.src,M4sse/chromium.src,Jonekee/chromium.src,zcbenz/cefode-chromium,mohamed--abdel-maksoud/chromium.src,zcbenz/cefode-chromium,nacl-webkit/chrome_deps,mogoweb/chromium-crosswalk,TheTypoMaster/chromium-crosswalk,Jonekee/chromium.src,anirudhSK/chromium,Jonekee/chromium.src,timopulkkinen/BubbleFish,hgl888/chromium-crosswalk-efl,nacl-webkit/chrome_deps,axinging/chromium-crosswalk,keishi/chromium,patrickm/chromium.src,fujunwei/chromium-crosswalk,hgl888/chromium-crosswalk,robclark/chromium,ChromiumWebApps/chromium,crosswalk-project/chromium-crosswalk-efl,rogerwang/chromium,hgl888/chromium-crosswalk-efl,ltilve/chromium,rogerwang/chromium,Chilledheart/chromium,zcbenz/cefode-chromium,Fireblend/chromium-crosswalk,markYoungH/chromium.src,pozdnyakov/chromium-crosswalk,hujiajie/pa-chromium,dushu1203/chromium.src,ChromiumWebApps/chromium,rogerwang/chromium,Jonekee/chromium.src,hujiajie/pa-chromium,hujiajie/pa-chromium,ChromiumWebApps/chromium,markYoungH/chromium.src,rogerwang/chromium,Jonekee/chromium.src,anirudhSK/chromium,rogerwang/chromium,M4sse/chromium.src,patrickm/chromium.src,krieger-od/nwjs_chromium.src,ltilve/chromium,fujunwei/chromium-crosswalk,dushu1203/chromium.src,junmin-zhu/chromium-rivertrail,Fireblend/chromium-crosswalk,littlstar/chromium.src,PeterWangIntel/chromium-crosswalk,axinging/chromium-crosswalk,anirudhSK/chromium,keishi/chromium,hgl888/chromium-crosswalk,hgl888/chromium-crosswalk,ondra-novak/chromium.src,axinging/chromium-crosswalk,robclark/chromium,dushu1203/chromium.src,timopulkkinen/BubbleFish,hgl888/chromium-crosswalk,zcbenz/cefode-chromium,zcbenz/cefode-chromium,fujunwei/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,dushu1203/chromium.src,Pluto-tv/chromium-crosswalk,Fireblend/chromium-crosswalk,keishi/chromium,Jonekee/chromium.src,hujiajie/pa-chromium,bright-sparks/chromium-spacewalk,TheTypoMaster/chromium-crosswalk,dednal/chromium.src,nacl-webkit/chrome_deps,patrickm/chromium.src,M4sse/chromium.src,rogerwang/chromium,ChromiumWebApps/chromium,ltilve/chromium,Jonekee/chromium.src,dednal/chromium.src,PeterWangIntel/chromium-crosswalk,anirudhSK/chromium,M4sse/chromium.src,zcbenz/cefode-chromium,ondra-novak/chromium.src,keishi/chromium,krieger-od/nwjs_chromium.src,Fireblend/chromium-crosswalk,littlstar/chromium.src,rogerwang/chromium,Pluto-tv/chromium-crosswalk,ondra-novak/chromium.src,hgl888/chromium-crosswalk-efl,bright-sparks/chromium-spacewalk,Chilledheart/chromium,littlstar/chromium.src,markYoungH/chromium.src,chuan9/chromium-crosswalk,fujunwei/chromium-crosswalk,ondra-novak/chromium.src,ondra-novak/chromium.src,TheTypoMaster/chromium-crosswalk,crosswalk-project/chromium-crosswalk-efl,dednal/chromium.src,anirudhSK/chromium,ChromiumWebApps/chromium,Just-D/chromium-1,hgl888/chromium-crosswalk-efl,M4sse/chromium.src,M4sse/chromium.src,crosswalk-project/chromium-crosswalk-efl,jaruba/chromium.src,Pluto-tv/chromium-crosswalk,crosswalk-project/chromium-crosswalk-efl,TheTypoMaster/chromium-crosswalk,timopulkkinen/BubbleFish,ChromiumWebApps/chromium,Pluto-tv/chromium-crosswalk,axinging/chromium-crosswalk,Just-D/chromium-1,crosswalk-project/chromium-crosswalk-efl,nacl-webkit/chrome_deps,pozdnyakov/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,axinging/chromium-crosswalk,nacl-webkit/chrome_deps,robclark/chromium,crosswalk-project/chromium-crosswalk-efl,chuan9/chromium-crosswalk,krieger-od/nwjs_chromium.src,axinging/chromium-crosswalk,junmin-zhu/chromium-rivertrail,axinging/chromium-crosswalk,dushu1203/chromium.src,axinging/chromium-crosswalk,Jonekee/chromium.src,mogoweb/chromium-crosswalk,timopulkkinen/BubbleFish,ChromiumWebApps/chromium,pozdnyakov/chromium-crosswalk,anirudhSK/chromium,dednal/chromium.src,hujiajie/pa-chromium,crosswalk-project/chromium-crosswalk-efl,Fireblend/chromium-crosswalk,ondra-novak/chromium.src,hujiajie/pa-chromium,anirudhSK/chromium,zcbenz/cefode-chromium,bright-sparks/chromium-spacewalk,TheTypoMaster/chromium-crosswalk,timopulkkinen/BubbleFish,jaruba/chromium.src,Chilledheart/chromium,bright-sparks/chromium-spacewalk,patrickm/chromium.src,krieger-od/nwjs_chromium.src,timopulkkinen/BubbleFish,anirudhSK/chromium,dednal/chromium.src,Fireblend/chromium-crosswalk,junmin-zhu/chromium-rivertrail