partial PageClickTracker migration to RenderFrameObserver

content/renderer/render_frame_impl.h

Index: content/renderer/render_frame_impl.h
diff --git a/content/renderer/render_frame_impl.h b/content/renderer/render_frame_impl.h
index e4f2901a32959a0b3d03a73ca3d5e8e76a896f4d..095ecd290a3882d69cf4dafeec559d46139d3a5f 100644
--- a/content/renderer/render_frame_impl.h
+++ b/content/renderer/render_frame_impl.h
@@ -290,6 +290,7 @@ class CONTENT_EXPORT RenderFrameImpl
   RenderView* GetRenderView() override;
   int GetRoutingID() override;
   blink::WebLocalFrame* GetWebFrame() override;
+  blink::WebElement GetFocusedElement() const override;
   WebPreferences& GetWebkitPreferences() override;
   int ShowContextMenu(ContextMenuClient* client,
                       const ContextMenuParams& params) override;
@@ -571,10 +572,6 @@ class CONTENT_EXPORT RenderFrameImpl
   // Builds and sends DidCommitProvisionalLoad to the host.
   void SendDidCommitProvisionalLoad(blink::WebFrame* frame);
 
-  // Gets the focused element. If no such element exists then the element will
-  // be NULL.
-  blink::WebElement GetFocusedElement();
-
   // IPC message handlers ------------------------------------------------------
   //
   // The documentation for these functions should be in