Git footers doesn't seem to support v8, let alone know that trunk actually maps
to the candidate branch.  This should fix it.

BUG=
TBR=agable

Review URL: https://codereview.chromium.org/645183002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@292445 0039d316-1c4b-4281-b951-d872f2087c98