Revert 136296 - Make all extension api types fully qualified.

chrome/common/extensions/api/contextMenus.json

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 [
   {
     "namespace": "contextMenus",
     "dependencies": [ "tabs" ],
     "types": [
       {
@@ skipping 91 matching lines @@
                 "optional": true,
                 "description": "A function that will be called back when the menu item is clicked.",
                 "parameters": [
                   {
                     "name": "info",
                     "$ref": "OnClickData",
                     "description": "Information about the item clicked and the context where the click happened."
                   },
                   {
                     "name": "tab",
-                    "$ref": "tabs.Tab",
+                    "$ref": "Tab",
                     "description": "The details of the tab where the click took place."
                   }
                 ]
               },
               "parentId": {
                 "type": "integer",
                 "optional": true,
                 "description": "The ID of a parent menu item; this makes the item a child of a previously added item."
               },
               "documentUrlPatterns": {
@@ skipping 124 matching lines @@
             "name": "callback",
             "optional": true,
             "parameters": [],
             "description": "Called when removal is complete."
           }
         ]
       }
     ]
   }
 ]