Lazily require types when validating Extensions API calls

chrome/common/extensions/api/storage.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": "storage",
     "unprivileged": true,
     "types": [
       {
         "id": "StorageChange",
         "type": "object",
         "properties": {
           "oldValue": {
             "type": "any",
             "description": "The old value of the item, if there was an old value.",
             "optional": true
           },
           "newValue": {
             "type": "any",
             "description": "The new value of the item, if there is a new value.",
             "optional": true
           }
         }
       },
       {
         "id": "StorageArea",
         "type": "object",
+        "js_module": "StorageArea",
         "functions": [
           {
             "name": "get",
             "type": "function",
             "description": "Gets one or more items from storage.",
             "parameters": [
               {
                 "name": "keys",
                 "choices": [
                   { "type": "string" },
@@ skipping 170 matching lines @@
       },
       "managed": {
         "$ref": "StorageArea",
         "description": "Items in the <code>managed</code> storage area are set by the domain administrator, and are read-only by the extension; trying to modify this namespace results in an error.",
         "value": [ "managed" ],
         "nodoc": true
       }
     }
   }
 ]