Fix the call to "git checkout" on Windows.

The "^0" is not needed, and it confuses Windows since
the carret is a special character.
Review URL: http://codereview.chromium.org/6976050

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@87636 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed