Migrate accessibility from RenderView to RenderFrame.

content/browser/renderer_host/render_view_host_delegate.h

Index: content/browser/renderer_host/render_view_host_delegate.h
diff --git a/content/browser/renderer_host/render_view_host_delegate.h b/content/browser/renderer_host/render_view_host_delegate.h
index 51fc3dc5057fcc1449ad7bcc6e6a536533e20117..17631c97ecec4fe3bf1b95900dcd4e61cde9646c 100644
--- a/content/browser/renderer_host/render_view_host_delegate.h
+++ b/content/browser/renderer_host/render_view_host_delegate.h
@@ -52,7 +52,6 @@ class SessionStorageNamespace;
 class SiteInstance;
 class WebContents;
 class WebContentsImpl;
-struct AXEventNotificationDetails;
 struct FileChooserParams;
 struct GlobalRequestID;
 struct NativeWebKeyboardEvent;
@@ -287,10 +286,6 @@ class CONTENT_EXPORT RenderViewHostDelegate {
   // created by the RenderViewHost.
   virtual FrameTree* GetFrameTree();
 
-  // Invoked when an accessibility event is received from the renderer.
-  virtual void AccessibilityEventReceived(
-      const std::vector<AXEventNotificationDetails>& details) {}
-
  protected:
   virtual ~RenderViewHostDelegate() {}
 };