Remove a bunch of dead code from RenderLayer

sky/engine/core/dom/Element.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 1005 matching lines @@
 
 void Element::setNeedsAnimationStyleRecalc()
 {
     if (styleChangeType() != NoStyleChange)
         return;
 
     setNeedsStyleRecalc(LocalStyleChange);
     setAnimationStyleChange(true);
 }
 
-void Element::setNeedsCompositingUpdate()
-{
-    if (!document().isActive())
-        return;
-    RenderBoxModelObject* renderer = renderBoxModelObject();
-    if (!renderer)
-        return;
-    if (!renderer->hasLayer())
-        return;
-    renderer->layer()->setNeedsCompositingInputsUpdate();
-}
-
 void Element::setCustomElementDefinition(PassRefPtr<CustomElementDefinition> definition)
 {
     if (!hasRareData() && !definition)
         return;
     ASSERT(!customElementDefinition());
     ensureElementRareData().setCustomElementDefinition(definition);
 }
 
 CustomElementDefinition* Element::customElementDefinition() const
 {
@@ skipping 745 matching lines @@
         return false;
     // Turn off style sharing for elements that can gain layers for reasons outside of the style system.
     // See comments in RenderObject::setStyle().
     // FIXME: Why does gaining a layer from outside the style system require disabling sharing?
     if (isHTMLCanvasElement(*this))
         return false;
     return true;
 }
 
 } // namespace blink