[Mac/Linux] clean up the shmem file at the end of each testshell run. - Mac/Linux back shmem with a file, but the file isn't cleaned up (since it could be shared), this pulls over the same basic code we used in chrome_test_suite to clean up the files there also so they don't leak a fill up the bots.
[Mac/Linux] clean up the shmem file at the end of each testshell run.
- Mac/Linux back shmem with a file, but the file isn't cleaned up (since it could be shared), this pulls over the same basic code we used in chrome_test_suite to clean up the files there also so they don't leak a fill up the bots.

BUG=32391
TEST=nothing, http://crbug.com/36261 prevents this from really cleaning up resource leaks
Review URL: http://codereview.chromium.org/651038

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@39463 0039d316-1c4b-4281-b951-d872f2087c98

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