Remove optimization to lazily allocate transparency layers in LayerPainter.

Source/core/rendering/RenderLayer.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
  *   Randall Jesup <rjesup@wgate.com>
@@ skipping 1057 matching lines @@
 bool RenderLayer::hasAncestorWithFilterOutsets() const
 {
     for (const RenderLayer* curr = this; curr; curr = curr->parent()) {
         RenderLayerModelObject* renderer = curr->renderer();
         if (renderer->style()->hasFilterOutsets())
             return true;
     }
     return false;
 }
 
-RenderLayer* RenderLayer::transparentPaintingAncestor()
-{
-    if (hasCompositedLayerMapping())
-        return 0;
-
-    for (RenderLayer* curr = parent(); curr; curr = curr->parent()) {
-        if (curr->hasCompositedLayerMapping())
-            return 0;
-        if (curr->isTransparent())
-            return curr;
-    }
-    return 0;
-}
-
 static void expandClipRectForDescendantsAndReflection(LayoutRect& clipRect, const RenderLayer* layer, const RenderLayer* rootLayer,
     RenderLayer::TransparencyClipBoxBehavior transparencyBehavior, const LayoutSize& subPixelAccumulation, PaintBehavior paintBehavior)
 {
     // If we have a mask, then the clip is limited to the border box area (and there is
     // no need to examine child layers).
     if (!layer->renderer()->hasMask()) {
         // Note: we don't have to walk z-order lists since transparent elements always establish
         // a stacking container. This means we can just walk the layer tree directly.
         for (RenderLayer* curr = layer->firstChild(); curr; curr = curr->nextSibling()) {
             if (!layer->reflectionInfo() || layer->reflectionInfo()->reflectionLayer() != curr)
@@ skipping 1752 matching lines @@
     }
 }
 
 void showLayerTree(const blink::RenderObject* renderer)
 {
     if (!renderer)
         return;
     showLayerTree(renderer->enclosingLayer());
 }
 #endif