I guess I'm the only developer using git-cache, which is sad.
Hopefully these fixes will make it easier to adapt this to developer
usage some time in the FUTURE.

BUG=583420
TEST=Works for me
R=agable@chromium.org,tandrii@chromium.org

Review URL: https://codereview.chromium.org/1650993005

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@298531 0039d316-1c4b-4281-b951-d872f2087c98