Remove old Gerrit instances.

BUG=None
TEST=my_activity.py still works.

Review URL: https://codereview.chromium.org/714373002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@292935 0039d316-1c4b-4281-b951-d872f2087c98

my_activity.py

@@ -91,10 +91,6 @@ gerrit_instances = [
     'host': 'gerrit.chromium.org',
     'port': 29418,
   },
-  {
-    'host': 'gerrit-int.chromium.org',
-    'port': 29419,
-  },
 ]
 
 google_code_projects = [