Remove optimization to lazily allocate transparency layers in LayerPainter.

Source/core/rendering/RenderLayer.h

Index: Source/core/rendering/RenderLayer.h
diff --git a/Source/core/rendering/RenderLayer.h b/Source/core/rendering/RenderLayer.h
index 9fe19f85bca55ce6748b0c43efdaac45181d139f..f6a8c3681d3009e4ad727259633ca749754ca8fb 100644
--- a/Source/core/rendering/RenderLayer.h
+++ b/Source/core/rendering/RenderLayer.h
@@ -117,7 +117,6 @@ public:
     void setLayerType(LayerType layerType) { m_layerType = layerType; }
 
     bool isTransparent() const { return renderer()->isTransparent() || renderer()->hasBlendMode() || renderer()->hasMask(); }
-    RenderLayer* transparentPaintingAncestor();
 
     bool isReflection() const { return renderer()->isReplica(); }
     RenderLayerReflectionInfo* reflectionInfo() { return m_reflectionInfo.get(); }