i.e. the output looks like:

   my-branch-name : https://codereview.chromium.org/1234567
  my-other-branch : https://codereview.chromium.org/8675309

This makes it possible to double-click the branch name to use it in a subsequent
command.

BUG=none
R=maruel@chromium.org

Review URL: https://codereview.chromium.org/118613003

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@241731 0039d316-1c4b-4281-b951-d872f2087c98