Revert of Revert of Migrate accessibility from RenderView to RenderFrame.

content/renderer/accessibility/renderer_accessibility.cc

Index: content/renderer/accessibility/renderer_accessibility.cc
diff --git a/content/renderer/accessibility/renderer_accessibility.cc b/content/renderer/accessibility/renderer_accessibility.cc
index 9a575a147612d9fccca3e9a3fa305b5f68d5213f..1bf402267815b09443aad20f6415c70ce24dc527 100644
--- a/content/renderer/accessibility/renderer_accessibility.cc
+++ b/content/renderer/accessibility/renderer_accessibility.cc
@@ -4,6 +4,7 @@
 
 #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"
@@ -16,16 +17,16 @@
 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)