Remove the CSS_COMPOSITING define, the CSS blending and compositing

WebCore/rendering/RenderLayerCompositor.cpp

 /*
  * Copyright (C) 2009, 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 1865 matching lines @@
 
     return renderer->hasFilter();
 #else
     UNUSED_PARAM(renderer);
     return false;
 #endif
 }
 
 bool RenderLayerCompositor::requiresCompositingForBlending(RenderObject* renderer) const
 {
-#if ENABLE(CSS_COMPOSITING)
     return renderer->hasBlendMode();
-#else
-    UNUSED_PARAM(renderer);
-    return false;
-#endif
 }
 
 bool RenderLayerCompositor::requiresCompositingForPosition(RenderObject* renderer, const RenderLayer* layer, RenderLayer::ViewportConstrainedNotCompositedReason* viewportConstrainedNotCompositedReason) const
 {
     // position:fixed elements that create their own stacking context (e.g. have an explicit z-index,
     // opacity, transform) can get their own composited layer. A stacking context is required otherwise
     // z-index and clipping will be broken.
     if (!renderer->isPositioned())
         return false;
     
@@ skipping 876 matching lines @@
     info.addMember(m_layerForOverhangAreas, "layerForOverhangAreas");
     info.addMember(m_contentShadowLayer, "contentShadowLayer");
     info.addMember(m_layerForTopOverhangArea, "layerForTopOverhangArea");
     info.addMember(m_layerForBottomOverhangArea, "layerForBottomOverhangArea");
     info.addMember(m_layerForHeader, "layerForHeader");
     info.addMember(m_layerForFooter, "layerForFooter");
 #endif
 }
 
 } // namespace WebCore