Fix ExtensionOptionsGuest style and minor bug

chrome/renderer/resources/extensions/extension_options.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 DocumentNatives = requireNative('document_natives');
 var ExtensionOptionsEvents =
     require('extensionOptionsEvents').ExtensionOptionsEvents;
 var GuestViewInternal =
     require('binding').Binding.create('guestViewInternal').generate();
 var IdGenerator = requireNative('id_generator');
@@ skipping 35 matching lines @@
   this.browserPluginNode = this.createBrowserPluginNode();
   var shadowRoot = this.extensionoptionsNode.createShadowRoot();
   shadowRoot.appendChild(this.browserPluginNode);
 };
 
 ExtensionOptionsInternal.prototype.attachWindow = function() {
   return guestViewInternalNatives.AttachGuest(
       this.internalInstanceId,
       this.guestInstanceId,
       {
-        'autosize': this.autosize,
+        'autosize': this.extensionoptionsNode.hasAttribute('autosize'),
         'instanceId': this.viewInstanceId,
         'maxheight': parseInt(this.maxheight || 0),
         'maxwidth': parseInt(this.maxwidth || 0),
         'minheight': parseInt(this.minheight || 0),
         'minwidth': parseInt(this.minwidth || 0)
       });
 };
 
 ExtensionOptionsInternal.prototype.createBrowserPluginNode = function() {
   var browserPluginNode = new ExtensionOptionsInternal.BrowserPlugin();
@@ skipping 300 matching lines @@
 
 var useCapture = true;
 window.addEventListener('readystatechange', function listener(event) {
   if (document.readyState == 'loading')
     return;
 
   registerBrowserPluginElement();
   registerExtensionOptionsElement();
   window.removeEventListener(event.type, listener, useCapture);
 }, useCapture);