Remove codes related to scaling in GraphicsLayer tree.

Source/core/platform/graphics/GraphicsLayerClient.h

 /*
  * Copyright (C) 2009 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 49 matching lines @@
     // Callback for when hardware-accelerated animation started.
     virtual void notifyAnimationStarted(const GraphicsLayer*, double time) = 0;
 
     virtual void paintContents(const GraphicsLayer*, GraphicsContext&, GraphicsLayerPaintingPhase, const IntRect& inClip) = 0;
     virtual void didCommitChangesForLayer(const GraphicsLayer*) const { }
 
     // Provides current transform (taking transform-origin and animations into account). Input matrix has been
     // initialized to identity already. Returns false if the layer has no transform.
     virtual bool getCurrentTransform(const GraphicsLayer*, TransformationMatrix&) const { return false; }
 
-    // Multiplier for backing store size, related to high DPI.
-    virtual float deviceScaleFactor() const { return 1; }
-    // Page scale factor.
-    virtual float pageScaleFactor() const { return 1; }
-
     virtual bool isTrackingRepaints() const { return false; }
 
 #ifndef NDEBUG
     // RenderLayerBacking overrides this to verify that it is not
     // currently painting contents. An ASSERT fails, if it is.
     // This is executed in GraphicsLayer construction and destruction
     // to verify that we don't create or destroy GraphicsLayers
     // while painting.
     virtual void verifyNotPainting() { }
 #endif
 };
 
 } // namespace WebCore
 
 #endif // GraphicsLayerClient_h