Remove codes related to scaling in GraphicsLayer tree.

Source/core/rendering/RenderLayerBacking.cpp

Index: Source/core/rendering/RenderLayerBacking.cpp
diff --git a/Source/core/rendering/RenderLayerBacking.cpp b/Source/core/rendering/RenderLayerBacking.cpp
index 44230d97dff274129eb0435a2839c3808e3266e8..12c3f2fcaf88eb6ae00117b371245ba93efdfe5a 100644
--- a/Source/core/rendering/RenderLayerBacking.cpp
+++ b/Source/core/rendering/RenderLayerBacking.cpp
@@ -135,7 +135,6 @@ PassOwnPtr<GraphicsLayer> RenderLayerBacking::createGraphicsLayer(const String&
 #else
     UNUSED_PARAM(name);
 #endif
-    graphicsLayer->setMaintainsPixelAlignment(compositor()->keepLayersPixelAligned());
     
     return graphicsLayer.release();
 }
@@ -1681,16 +1680,6 @@ void RenderLayerBacking::paintContents(const GraphicsLayer* graphicsLayer, Graph
 #endif
 }
 
-float RenderLayerBacking::pageScaleFactor() const
-{
-    return compositor()->pageScaleFactor();
-}
-
-float RenderLayerBacking::deviceScaleFactor() const
-{
-    return compositor()->deviceScaleFactor();
-}
-
 void RenderLayerBacking::didCommitChangesForLayer(const GraphicsLayer* layer) const
 {
 }