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: http://src.chromium.org/svn/trunk/src@12429 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 966929bb0458e4202ba9c123cbb485b3a79491d6
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser