Make miscellaneous_bindings and event_bindings Required as needed. Previously

chrome/renderer/resources/extensions/downloads_custom_bindings.js

 // Copyright (c) 2013 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 bindings for the downloads API.
 
 var binding = require('binding').Binding.create('downloads');
-var chromeHidden = requireNative('chrome_hidden').GetChromeHidden();
 var downloadsInternal = require('binding').Binding.create(
     'downloadsInternal').generate();
+var eventBindings = require('event_bindings');
 
-chromeHidden.Event.registerArgumentMassager(
+eventBindings.registerArgumentMassager(
     'downloads.onDeterminingFilename',
     function massage_determining_filename(args, dispatch) {
   var downloadItem = args[0];
   // Copy the id so that extensions can't change it.
   var downloadId = downloadItem.id;
   var suggestable = true;
   function suggestCallback(result) {
     if (!suggestable) {
       console.error('suggestCallback may not be called more than once.');
       return;
@@ skipping 17 matching lines @@
                  (results.results.length != 0) &&
                  (results.results[0] === true));
     if (suggestable && !async)
       suggestCallback();
   } catch (e) {
     suggestCallback();
     throw e;
   }
 });
 exports.binding = binding.generate();