Remove a bunch of dead code from RenderLayer

sky/engine/core/rendering/RenderBoxModelObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2010 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 45 matching lines @@
         RenderObject::setSelectionState(state);
 
     // FIXME: We should consider whether it is OK propagating to ancestor RenderInlines.
     // This is a workaround for http://webkit.org/b/32123
     // The containing block can be null in case of an orphaned tree.
     RenderBlock* containingBlock = this->containingBlock();
     if (containingBlock && !containingBlock->isRenderView())
         containingBlock->setSelectionState(state);
 }
 
-void RenderBoxModelObject::contentChanged(ContentChangeType changeType)
-{
-    if (!hasLayer())
-        return;
-
-    layer()->contentChanged(changeType);
-}
-
 bool RenderBoxModelObject::hasAcceleratedCompositing() const
 {
     // FIXME(sky): Remove
     return false;
 }
 
 InterpolationQuality RenderBoxModelObject::chooseInterpolationQuality(GraphicsContext* context, Image* image, const void* layer, const LayoutSize& size)
 {
     return ImageQualityController::imageQualityController()->chooseInterpolationQuality(context, this, image, layer, size);
 }
@@ skipping 2452 matching lines @@
     ASSERT(!beforeChild || toBoxModelObject == beforeChild->parent());
     for (RenderObject* child = slowFirstChild(); child; ) {
         // Save our next sibling as moveChildTo will clear it.
         RenderObject* nextSibling = child->nextSibling();
         moveChildTo(toBoxModelObject, child, beforeChild, fullRemoveInsert);
         child = nextSibling;
     }
 }
 
 } // namespace blink