Remove codes related to scaling in GraphicsLayer tree.

Source/core/platform/graphics/GraphicsLayerClient.h

Index: Source/core/platform/graphics/GraphicsLayerClient.h
diff --git a/Source/core/platform/graphics/GraphicsLayerClient.h b/Source/core/platform/graphics/GraphicsLayerClient.h
index c3fcc2ec6472bdc31b6d366f8ee74a2a6d891af7..277deeb7a9e298eb85983a44b68c7b40dc878c38 100644
--- a/Source/core/platform/graphics/GraphicsLayerClient.h
+++ b/Source/core/platform/graphics/GraphicsLayerClient.h
@@ -67,11 +67,6 @@ public:
     // 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