Fetch repository root for git-svn checkouts.
Fetch repository root for git-svn checkouts.

BUG=None
TEST=None

Review URL: http://codereview.chromium.org/6609039

git-svn-id: http://src.chromium.org/svn/trunk/src@76890 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 4aeb0096112f183600f58c29e66a125a046cf737
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