Introduced git+http(s) fake URL schema to support git urls which don't have "filename.git" portion (http://foo/bar vs http://foo/bar/filename.git).

Review URL: http://codereview.chromium.org/8590024

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@110937 0039d316-1c4b-4281-b951-d872f2087c98