Lazily require types when validating Extensions API calls

chrome/common/extensions/api/types.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": "types",
     "types": [
       {
         "id": "ChromeSetting",
         "type": "object",
+        "js_module": "ChromeSetting",
         "customBindings": "ChromeSetting",
         "description": "An interface which allows access to a Chrome browser setting.",
         "functions": [
           {
             "name": "get",
             "type": "function",
             "description": "Gets the value of a setting.",
             "parameters": [
               {
                 "name": "details",
@@ skipping 120 matching lines @@
                   }
                 }
               }
             ]
           }
         ]
       }
     ]
   }
 ]