content: convert accessibility notifications to observer usage

content/public/browser/render_view_host_observer.cc

 // Copyright (c) 2012 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.
 
 #include "content/public/browser/render_view_host_observer.h"
 
 #include "content/browser/renderer_host/render_view_host_impl.h"
 
 namespace content {
 
@@ skipping 11 matching lines @@
 void RenderViewHostObserver::RenderViewHostInitialized() {
 }
 
 void RenderViewHostObserver::RenderViewHostDestroyed(RenderViewHost* rvh) {
   delete this;
 }
 
 void RenderViewHostObserver::Navigate(const GURL& url) {
 }
 
+void RenderViewHostObserver::AccessibilityLayoutComplete() {
+}
+
+void RenderViewHostObserver::AccessibilityLoadComplete() {
+}
+
 bool RenderViewHostObserver::OnMessageReceived(const IPC::Message& message) {
   return false;
 }
 
 bool RenderViewHostObserver::Send(IPC::Message* message) {
   if (!render_view_host_) {
     delete message;
     return false;
   }
 
   return render_view_host_->Send(message);
 }
 
 RenderViewHost* RenderViewHostObserver::render_view_host() const {
   return render_view_host_;
 }
 
 void RenderViewHostObserver::RenderViewHostDestruction() {
   render_view_host_->RemoveObserver(this);
   RenderViewHost* rvh = render_view_host_;
   render_view_host_ = NULL;
   RenderViewHostDestroyed(rvh);
 }
 
 }  // namespace content