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 d856537dd2cce6fa0ba3c05fd85904c002429555..8c453a3f58fc44ad33c14e8ad61103dcfd360886 100644
--- a/content/browser/renderer_host/render_view_host_delegate.h
+++ b/content/browser/renderer_host/render_view_host_delegate.h
@@ -51,7 +51,6 @@ class SessionStorageNamespace;
 class SiteInstance;
 class WebContents;
 class WebContentsImpl;
-struct AXEventNotificationDetails;
 struct FileChooserParams;
 struct GlobalRequestID;
 struct NativeWebKeyboardEvent;
@@ -284,10 +283,6 @@ 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() {}
 };