Move some extensions renderer resources to extensions_renderer_resources.grd.

extensions/renderer/resources/test_custom_bindings.js

 // 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.
 
 // test_custom_bindings.js
 // mini-framework for ExtensionApiTest browser tests
 
 var binding = require('binding').Binding.create('test');
 
 var chrome = requireNative('chrome').GetChrome();
@@ skipping 333 matching lines @@
     return userGestures.RunWithoutUserGesture(callback);
   });
 
   apiFunctions.setHandleRequest('setExceptionHandler', function(callback) {
     chromeTest.assertEq(typeof(callback), 'function');
     uncaughtExceptionHandler.setHandler(callback);
   });
 });
 
 exports.binding = binding.generate();