This is useful if git-cl has no way to find out the original svn repo's url
and the user does not wish to configure git-svn and fetch the repository.

Review URL: http://codereview.chromium.org/9969099

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@130372 0039d316-1c4b-4281-b951-d872f2087c98