Make sure paths that look like http://git_server/repo.git@SHA get checked out

correctly.  The current behavior was to call git clone with --no-checkout, which
did not create a working copy, and made the checkout unusable by the users.
Review URL: http://codereview.chromium.org/7104007

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@87491 0039d316-1c4b-4281-b951-d872f2087c98

gclient_scm.py

@@ -488,7 +488,6 @@ class GitWrapper(SCMWrapper):
       clone_cmd.extend(['-b', revision.replace('refs/heads/', '')])
       detach_head = False
     else:
-      clone_cmd.append('--no-checkout')
       detach_head = True
     if options.verbose:
       clone_cmd.append('--verbose')