Revert of mac: History swiping doesn't work right with iframes.

content/port/browser/render_widget_host_view_port.h

Index: content/port/browser/render_widget_host_view_port.h
diff --git a/content/port/browser/render_widget_host_view_port.h b/content/port/browser/render_widget_host_view_port.h
index eaebd1a4a5e235fc24b08fa3c82b35ca65e02008..528ac864e92ad70d72b5464b9e92921450ce8d6e 100644
--- a/content/port/browser/render_widget_host_view_port.h
+++ b/content/port/browser/render_widget_host_view_port.h
@@ -288,12 +288,8 @@
   virtual void SetScrollOffsetPinning(
       bool is_pinned_to_left, bool is_pinned_to_right) = 0;
 
-  // When a wheel event is first received, it is sent to the renderer.  This
-  // method is invoked once the renderer, and |delegate_| have been given a
-  // chance to process the wheel event. |consumed| indicates whether either
-  // chose to process the |event|. At most one entity should consume an event.
-  virtual void HandledWheelEvent(const blink::WebMouseWheelEvent& event,
-                                 bool consumed) = 0;
+  // Called when a mousewheel event was not processed by the renderer.
+  virtual void UnhandledWheelEvent(const blink::WebMouseWheelEvent& event) = 0;
 
   // Called prior to forwarding input event messages to the renderer, giving
   // the view a chance to perform in-process event filtering or processing.