Lazily load extension API schemas

chrome/common/extensions/api/bookmark_manager_private.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": "bookmarkManagerPrivate",
     "nodoc": true,
-    "dependencies": [ "bookmarks" ],
     "types": [
       {
         "id": "BookmarkNodeDataElement",
         "nodoc": true,
         "type": "object",
         "properties": {
           "id": {
             "type": "string",
             "optional": true,
             "description": "The ID of the bookmark. This is only provided if the data is from the same profile."
@@ skipping 230 matching lines @@
         "name": "onDrop",
         "type": "function",
         "description": "Fired when the user drops bookmarks on the document",
         "parameters": [
           {"name": "bookmarkNodeData", "$ref": "BookmarkNodeData"}
         ]
       }
     ]
   }
 ]