Get rid of HitTestChildBlockBackground walk.

sky/engine/core/rendering/RenderObject.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 58 matching lines @@
 };
 
 enum HitTestFilter {
     HitTestAll,
     HitTestSelf,
     HitTestDescendants
 };
 
 enum HitTestAction {
     HitTestBlockBackground,
-    HitTestChildBlockBackground,
-    HitTestChildBlockBackgrounds,
     HitTestForeground
 };
 
 // Sides used when drawing borders and outlines. The values should run clockwise from top.
 enum BoxSide {
     BSTop,
     BSRight,
     BSBottom,
     BSLeft
 };
@@ skipping 825 matching lines @@
 void showTree(const blink::RenderObject*);
 void showLineTree(const blink::RenderObject*);
 void showRenderTree(const blink::RenderObject* object1);
 // We don't make object2 an optional parameter so that showRenderTree
 // can be called from gdb easily.
 void showRenderTree(const blink::RenderObject* object1, const blink::RenderObject* object2);
 
 #endif
 
 #endif  // SKY_ENGINE_CORE_RENDERING_RENDEROBJECT_H_