Make miscellaneous_bindings and event_bindings Required as needed. Previously

chrome/renderer/resources/extensions/webstore_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.
 
 // Custom binding for the webstore API.
 
 var webstoreNatives = requireNative('webstore');
 
 function Installer() {
   this._pendingInstall = null;
@@ skipping 32 matching lines @@
 
 var installer = new Installer();
 
 var chromeWebstore = {
   install: function install(url, onSuccess, onFailure) {
     installer.install(url, onSuccess, onFailure);
   }
 };
 
 // Called by webstore_binding.cc.
-var chromeHiddenWebstore = {
-  onInstallResponse: function(installId, success, error) {
-    installer.onInstallResponse(installId, success, error);
-  }
-};
+function onInstallResponse(installId, success, error) {
+  installer.onInstallResponse(installId, success, error);
+}
 
 // These must match the names in InstallWebstorebinding in
 // chrome/renderer/extensions/dispatcher.cc.
 exports.chromeWebstore = chromeWebstore;
-exports.chromeHiddenWebstore = chromeHiddenWebstore;
+exports.onInstallResponse = onInstallResponse;