<webview>: Move autosize from content to chrome

chrome/renderer/resources/extensions/web_view_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.
 
 // Event management for WebViewInternal.
 
 var DeclarativeWebRequestSchema =
     requireNative('schema_registry').GetSchema('declarativeWebRequest');
 var EventBindings = require('event_bindings');
 var IdGenerator = requireNative('id_generator');
@@ skipping 579 matching lines @@
       if (allowed) {
         return;
       }
       showWarningMessage(event.permission);
     });
   }
 };
 
 WebViewEvents.prototype.handleSizeChangedEvent = function(
     event, webViewEvent) {
-  this.webViewInternal.onSizeChanged(webViewEvent.newWidth,
-                                     webViewEvent.newHeight);
-  this.webViewInternal.dispatchEvent(webViewEvent);
+  this.webViewInternal.onSizeChanged(webViewEvent);
 };
 
 exports.WebViewEvents = WebViewEvents;
 exports.CreateEvent = CreateEvent;