Delete some dead reflection code in CompositedLayerMapping.

Source/platform/graphics/GraphicsLayer.h

Index: Source/platform/graphics/GraphicsLayer.h
diff --git a/Source/platform/graphics/GraphicsLayer.h b/Source/platform/graphics/GraphicsLayer.h
index 7b55157e8e89ab75628f657770f587a1ac8a789b..059f639419051611916c8d1aed6e2113746439a3 100644
--- a/Source/platform/graphics/GraphicsLayer.h
+++ b/Source/platform/graphics/GraphicsLayer.h
@@ -134,9 +134,6 @@ public:
     // The layer being replicated.
     GraphicsLayer* replicatedLayer() const { return m_replicatedLayer; }
 
-    const FloatPoint& replicatedLayerPosition() const { return m_replicatedLayerPosition; }
-    void setReplicatedLayerPosition(const FloatPoint& p) { m_replicatedLayerPosition = p; }
-
     enum ShouldSetNeedsDisplay {
         DontSetNeedsDisplay,
         SetNeedsDisplay