Move some extensions renderer resources to extensions_renderer_resources.grd.

chrome/renderer/resources/extensions/unload_event.js

-// Copyright 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.
-
-// Special unload event. We don't use the DOM unload because that slows down
-// tab shutdown. On the other hand, onUnload might not always fire, since
-// Chrome will terminate renderers on shutdown (SuddenTermination).
-
-// Implement a primitive subset of the Event interface as needed, since if this
-// was to use the real event object there would be a circular dependency.
-var listeners = [];
-
-exports.addListener = function(listener) {
-  $Array.push(listeners, listener);
-};
-
-exports.removeListener = function(listener) {
-  for (var i = 0; i < listeners.length; ++i) {
-    if (listeners[i] == listener) {
-      $Array.splice(listeners, i, 1);
-      return;
-    }
-  }
-};
-
-exports.wasDispatched = false;
-
-// dispatch() is called from C++.
-exports.dispatch = function() {
-  exports.wasDispatched = true;
-  for (var i = 0; i < listeners.length; ++i)
-    listeners[i]();
-};