Delete remaining masks dead code.

sky/engine/core/rendering/RenderLayer.h

 /*
  * Copyright (C) 2003, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Intel Corporation. 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>
@@ skipping 78 matching lines @@
     void removeOnlyThisLayer();
     void insertOnlyThisLayer();
 
     void styleChanged(StyleDifference, const RenderStyle* oldStyle);
 
     // FIXME: Many people call this function while it has out-of-date information.
     bool isSelfPaintingLayer() const { return m_isSelfPaintingLayer; }
 
     void setLayerType(LayerType layerType) { m_layerType = layerType; }
 
-    bool isTransparent() const { return renderer()->isTransparent() || renderer()->hasMask(); }
+    bool isTransparent() const { return renderer()->isTransparent(); }
     RenderLayer* transparentPaintingAncestor();
     void beginTransparencyLayers(GraphicsContext*, const RenderLayer* rootLayer, const LayoutRect& paintDirtyRect, const LayoutSize& subPixelAccumulation);
 
     const RenderLayer* root() const
     {
         const RenderLayer* curr = this;
         while (curr->parent())
             curr = curr->parent();
         return curr;
     }
@@ skipping 261 matching lines @@
 
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showLayerTree(const blink::RenderLayer*);
 void showLayerTree(const blink::RenderObject*);
 #endif
 
 #endif  // SKY_ENGINE_CORE_RENDERING_RENDERLAYER_H_