Revert of Keep track in the browser of which frames have onunload and onbeforeunload handlers.

content/browser/frame_host/render_frame_host_impl.h

Index: content/browser/frame_host/render_frame_host_impl.h
diff --git a/content/browser/frame_host/render_frame_host_impl.h b/content/browser/frame_host/render_frame_host_impl.h
index fd4505bed45df5077206dbfb11bfc0b37f17be93..ae2bfccdee8ab421771f1e479b43f6be583a0a0c 100644
--- a/content/browser/frame_host/render_frame_host_impl.h
+++ b/content/browser/frame_host/render_frame_host_impl.h
@@ -430,10 +430,6 @@
   // BeforeUnload IPC. This is the case if the current renderer is live and this
   // frame is the main frame.
   bool ShouldDispatchBeforeUnload();
-
-  // Returns true if the frame or any of its descendents have an onunload
-  // handler.
-  bool ShouldDispatchUnload();
 
   // Update the frame's opener in the renderer process in response to the
   // opener being modified (e.g., with window.open or being set to null) in
@@ -767,8 +763,6 @@
                                 base::string16 text,
                                 base::string16 html);
   void OnToggleFullscreen(bool enter_fullscreen);
-  void OnBeforeUnloadHandlersPresent(bool present);
-  void OnUnloadHandlersPresent(bool present);
   void OnDidStartLoading(bool to_different_document);
   void OnDidStopLoading();
   void OnDidChangeLoadProgress(double load_progress);
@@ -1000,10 +994,6 @@
   // When the last BeforeUnload message was sent.
   base::TimeTicks send_before_unload_start_time_;
 
-  // Used to track whether the frame has onbeforeunload and onunload handlers
-  bool has_beforeunload_handlers_;
-  bool has_unload_handlers_;
-
   // Set to true when there is a pending FrameMsg_BeforeUnload message.  This
   // ensures we don't spam the renderer with multiple beforeunload requests.
   // When either this value or IsWaitingForUnloadACK is true, the value of