gclient: fix regression in revision handling code in GitWrapper::update

Review URL: http://codereview.chromium.org/399040

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@32200 0039d316-1c4b-4281-b951-d872f2087c98

gclient_scm.py

@@ -119,7 +119,6 @@ class GitWrapper(SCMWrapper, scm.GIT):
       # Override the revision number.
       revision = str(options.revision)
     if revision:
-      url = '%s@%s' % (url, revision)
       rev_str = ' at %s' % revision
 
     if options.verbose: