Remove the CSS_COMPOSITING define, the CSS blending and compositing

WebCore/rendering/style/RenderStyle.cpp

 /*
  * Copyright (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Adobe Systems Incorporated. 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
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 602 matching lines @@
 
             // FIXME: We would like to use SimplifiedLayout for relative positioning, but we can't quite do that yet.
             // We need to make sure SimplifiedLayout can operate correctly on RenderInlines (we will need
             // to add a selfNeedsSimplifiedLayout bit in order to not get confused and taint every line).
             return StyleDifferenceLayout;
         } else if (m_box->zIndex() != other->m_box->zIndex() || m_box->hasAutoZIndex() != other->m_box->hasAutoZIndex()
                  || visual->clip != other->visual->clip || visual->hasClip != other->visual->hasClip)
             return StyleDifferenceRepaintLayer;
     }
     
-#if ENABLE(CSS_COMPOSITING)
     if (rareNonInheritedData->m_effectiveBlendMode != other->rareNonInheritedData->m_effectiveBlendMode)
         return StyleDifferenceRepaintLayer;
-#endif
 
     if (rareNonInheritedData->opacity != other->rareNonInheritedData->opacity) {
         // Don't return early here; instead take note of the type of change,
         // and deal with it when looking at compositing.
         changedContextSensitiveProperties |= ContextSensitivePropertyOpacity;
     }
 
 #if ENABLE(CSS_FILTERS)
     if (rareNonInheritedData->m_filter.get() != other->rareNonInheritedData->m_filter.get()
         && *rareNonInheritedData->m_filter.get() != *other->rareNonInheritedData->m_filter.get()) {
@@ skipping 961 matching lines @@
     info.addMember(inherited, "inherited");
     info.addMember(m_cachedPseudoStyles, "cachedPseudoStyles");
 #if ENABLE(SVG)
     info.addMember(m_svgStyle, "svgStyle");
 #endif
     info.addMember(inherited_flags, "inherited_flags");
     info.addMember(noninherited_flags, "noninherited_flags");
 }
 
 } // namespace WebCore