Remove codes related to scaling in GraphicsLayer tree.

Source/core/rendering/RenderLayerCompositor.h

Index: Source/core/rendering/RenderLayerCompositor.h
diff --git a/Source/core/rendering/RenderLayerCompositor.h b/Source/core/rendering/RenderLayerCompositor.h
index a9579cba1a1ae1936d8dfe1d15da85e350d54e85..edd86a2cef6c167c8b5fa12f8917a5864aea8586 100644
--- a/Source/core/rendering/RenderLayerCompositor.h
+++ b/Source/core/rendering/RenderLayerCompositor.h
@@ -204,14 +204,8 @@ public:
 
     String layerTreeAsText(LayerTreeFlags);
 
-    virtual float deviceScaleFactor() const OVERRIDE;
-    virtual float pageScaleFactor() const OVERRIDE;
     virtual void didCommitChangesForLayer(const GraphicsLayer*) const OVERRIDE;
 
-    bool keepLayersPixelAligned() const;
-
-    void deviceOrPageScaleFactorChanged();
-
     GraphicsLayer* layerForHorizontalScrollbar() const { return m_layerForHorizontalScrollbar.get(); }
     GraphicsLayer* layerForVerticalScrollbar() const { return m_layerForVerticalScrollbar.get(); }
     GraphicsLayer* layerForScrollCorner() const { return m_layerForScrollCorner.get(); }