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

content/browser/renderer_host/render_widget_host_view_android.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/render_widget_host_view_android.h"
 
 #include <android/bitmap.h>
 
 #include "base/android/sys_utils.h"
 #include "base/basictypes.h"
@@ skipping 1012 matching lines @@
 void RenderWidgetHostViewAndroid::SetHasHorizontalScrollbar(
     bool has_horizontal_scrollbar) {
   // intentionally empty, like RenderWidgetHostViewViews
 }
 
 void RenderWidgetHostViewAndroid::SetScrollOffsetPinning(
     bool is_pinned_to_left, bool is_pinned_to_right) {
   // intentionally empty, like RenderWidgetHostViewViews
 }
 
-void RenderWidgetHostViewAndroid::UnhandledWheelEvent(
-    const blink::WebMouseWheelEvent& event) {
-  // intentionally empty, like RenderWidgetHostViewViews
-}
-
 void RenderWidgetHostViewAndroid::GestureEventAck(
     const blink::WebGestureEvent& event,
     InputEventAckState ack_result) {
   if (content_view_core_)
     content_view_core_->OnGestureEventAck(event, ack_result);
 }
 
 InputEventAckState RenderWidgetHostViewAndroid::FilterInputEvent(
     const blink::WebInputEvent& input_event) {
   if (content_view_core_ &&
@@ skipping 340 matching lines @@
 // RenderWidgetHostView, public:
 
 // static
 RenderWidgetHostView*
 RenderWidgetHostView::CreateViewForWidget(RenderWidgetHost* widget) {
   RenderWidgetHostImpl* rwhi = RenderWidgetHostImpl::From(widget);
   return new RenderWidgetHostViewAndroid(rwhi, NULL);
 }
 
 } // namespace content