<extensionoptions>: Remove dead code

chrome/renderer/resources/extensions/extension_options_events.js

 // Copyright 2014 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.
 
 var CreateEvent = require('guestViewEvents').CreateEvent;
 var GuestViewEvents = require('guestViewEvents').GuestViewEvents;
 
 function ExtensionOptionsEvents(extensionOptionsImpl) {
   GuestViewEvents.call(this, extensionOptionsImpl);
 
   // |setupEventProperty| is normally called automatically, but the
   // 'createfailed' event is registered here because the event is fired from
   // ExtensionOptionsImpl instead of in response to an extension event.
   this.setupEventProperty('createfailed');
 }
 
 ExtensionOptionsEvents.prototype.__proto__ = GuestViewEvents.prototype;
 
 // A dictionary of <extensionoptions> extension events to be listened for. This
 // dictionary augments |GuestViewEvents.EVENTS| in guest_view_events.js. See the
 // documentation there for details.
 ExtensionOptionsEvents.EVENTS = {
   'close': {
     evt: CreateEvent('extensionOptionsInternal.onClose')
   },
   'load': {
     evt: CreateEvent('extensionOptionsInternal.onLoad')
   },
-  'sizechanged': {
-    evt: CreateEvent('extensionOptionsInternal.onSizeChanged'),
-    handler: 'handleSizeChangedEvent',
-    fields:['newWidth', 'newHeight', 'oldWidth', 'oldHeight']
-  },
   'preferredsizechanged': {
     evt: CreateEvent('extensionOptionsInternal.onPreferredSizeChanged'),
     fields:['width', 'height']
   }
 }
 
 ExtensionOptionsEvents.prototype.getEvents = function() {
   return ExtensionOptionsEvents.EVENTS;
 };
 
-ExtensionOptionsEvents.prototype.handleSizeChangedEvent = function(event,
-                                                                   eventName) {
-  this.view.onSizeChanged(
-      event.newWidth, event.newHeight, event.oldWidth, event.oldHeight);
-  var extensionOptionsEvent = this.makeDomEvent(event, eventName);
-  this.view.dispatchEvent(extensionOptionsEvent);
-}
-
 // Exports.
 exports.ExtensionOptionsEvents = ExtensionOptionsEvents;