GIT.CaptureStatus was assuming os.getcwd() was using all the time, which isn't
true when using trychange.py --sub_rep XXX.

R=dpranke@chromium.org
TEST=
BUG=


Review URL: http://codereview.chromium.org/8930002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@114264 0039d316-1c4b-4281-b951-d872f2087c98