Revert of Revert of Migrate accessibility from RenderView to RenderFrame.

content/browser/frame_host/render_frame_host_delegate.cc

 // 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.
 
 #include <stddef.h>
 
 #include "base/callback.h"
 #include "base/strings/string16.h"
 #include "content/browser/frame_host/render_frame_host_delegate.h"
+#include "ui/gfx/native_widget_types.h"
 #include "url/gurl.h"
 
 namespace content {
 
 bool RenderFrameHostDelegate::OnMessageReceived(
     RenderFrameHost* render_view_host,
     const IPC::Message& message) {
   return false;
 }
 
@@ skipping 16 matching lines @@
 }
 
 void RenderFrameHostDelegate::RequestMediaAccessPermission(
     const MediaStreamRequest& request,
     const MediaResponseCallback& callback) {
   callback.Run(MediaStreamDevices(),
                MEDIA_DEVICE_INVALID_STATE,
                scoped_ptr<MediaStreamUI>());
 }
 
+AccessibilityMode RenderFrameHostDelegate::GetAccessibilityMode() const {
+  return AccessibilityModeOff;
+}
+
+#if defined(OS_WIN)
+gfx::NativeViewAccessible
+    RenderFrameHostDelegate::GetParentNativeViewAccessible() {
+  return NULL;
+}
+#endif  // defined(OS_WIN)
+
 }  // namespace content