Migrate accessibility from RenderView to RenderFrame.

content/renderer/accessibility/renderer_accessibility.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/renderer/accessibility/renderer_accessibility.h"
 
+#include "content/renderer/render_frame_impl.h"
 #include "content/renderer/render_view_impl.h"
 #include "third_party/WebKit/public/web/WebDocument.h"
 #include "third_party/WebKit/public/web/WebFrame.h"
 #include "third_party/WebKit/public/web/WebView.h"
 
 using blink::WebDocument;
 using blink::WebFrame;
 using blink::WebView;
 
 namespace content {
 
 RendererAccessibility::RendererAccessibility(
-    RenderViewImpl* render_view)
-    : RenderViewObserver(render_view),
-      render_view_(render_view) {
+    RenderFrameImpl* render_frame)
+    : RenderFrameObserver(render_frame),
+      render_frame_(render_frame) {
 }
 
 RendererAccessibility::~RendererAccessibility() {
 }
 
 WebDocument RendererAccessibility::GetMainDocument() {
-  WebView* view = render_view()->GetWebView();
+  WebView* view = render_frame_->render_view()->GetWebView();
   WebFrame* main_frame = view ? view->mainFrame() : NULL;
 
   if (main_frame)
     return main_frame->document();
 
   return WebDocument();
 }
 
 }  // namespace content