Remove histogram from GraphicsLayerUpdater::rebuildTree

Source/core/rendering/compositing/GraphicsLayerUpdater.h

 /*
  * Copyright (C) 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2014 Google 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
@@ skipping 20 matching lines @@
 #include "wtf/Vector.h"
 
 namespace WebCore {
 
 class RenderLayer;
 class RenderPart;
 class RenderView;
 
 class GraphicsLayerUpdater {
 public:
-    explicit GraphicsLayerUpdater(RenderView&);
+    GraphicsLayerUpdater();
     ~GraphicsLayerUpdater();
 
     enum UpdateType {
         DoNotForceUpdate,
         ForceUpdate,
     };
 
     void updateRecursive(RenderLayer&, UpdateType);
-    void rebuildTree(RenderLayer&, UpdateType, GraphicsLayerVector& childLayersOfEnclosingLayer, int depth);
+    void rebuildTree(RenderLayer&, UpdateType, GraphicsLayerVector& childLayersOfEnclosingLayer);
 
 private:
     UpdateType update(RenderLayer&, UpdateType);
-
-    RenderView& m_renderView;
-
-    // Used for gathering UMA data about the effect on memory usage of promoting all layers
-    // that have a webkit-transition on opacity or transform and intersect the viewport.
-    double m_pixelsWithoutPromotingAllTransitions;
-    double m_pixelsAddedByPromotingAllTransitions;
 };
 
 } // namespace WebCore
 
 #endif // GraphicsLayerUpdater_h