Revert 284065 "Revert of Revert of Migrate accessibility from Re..."

trunk/src/content/browser/renderer_host/render_view_host_delegate.h

Index: trunk/src/content/browser/renderer_host/render_view_host_delegate.h
===================================================================
--- trunk/src/content/browser/renderer_host/render_view_host_delegate.h	(revision 284469)
+++ trunk/src/content/browser/renderer_host/render_view_host_delegate.h	(working copy)
@@ -51,6 +51,7 @@
 class SiteInstance;
 class WebContents;
 class WebContentsImpl;
+struct AXEventNotificationDetails;
 struct FileChooserParams;
 struct GlobalRequestID;
 struct NativeWebKeyboardEvent;
@@ -283,6 +284,10 @@
   // 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() {}
 };