Revert of Revert of Migrate accessibility from RenderView to RenderFrame.

content/renderer/accessibility/blink_ax_tree_source.h

Index: content/renderer/accessibility/blink_ax_tree_source.h
diff --git a/content/renderer/accessibility/blink_ax_tree_source.h b/content/renderer/accessibility/blink_ax_tree_source.h
index 52b908250b0a44c6d47957856e05b059a0835685..007df071052f54192146ba5178236b13212c0ab0 100644
--- a/content/renderer/accessibility/blink_ax_tree_source.h
+++ b/content/renderer/accessibility/blink_ax_tree_source.h
@@ -11,12 +11,12 @@
 
 namespace content {
 
-class RenderViewImpl;
+class RenderFrameImpl;
 
 class BlinkAXTreeSource
     : public ui::AXTreeSource<blink::WebAXObject> {
  public:
-  BlinkAXTreeSource(RenderViewImpl* render_view);
+  BlinkAXTreeSource(RenderFrameImpl* render_frame);
   virtual ~BlinkAXTreeSource();
 
   // Walks up the ancestor chain to see if this is a descendant of the root.
@@ -41,7 +41,7 @@
   blink::WebDocument GetMainDocument() const;
 
  private:
-  RenderViewImpl* render_view_;
+  RenderFrameImpl* render_frame_;
 };
 
 }  // namespace content