Remove histogram from GraphicsLayerUpdater::rebuildTree

Source/core/rendering/compositing/GraphicsLayerUpdater.h

Index: Source/core/rendering/compositing/GraphicsLayerUpdater.h
diff --git a/Source/core/rendering/compositing/GraphicsLayerUpdater.h b/Source/core/rendering/compositing/GraphicsLayerUpdater.h
index c374c036b800c6e08d121e7d96850a19c5ab9120..11cfea3894fa784d4fffa9e528837393e63b0110 100644
--- a/Source/core/rendering/compositing/GraphicsLayerUpdater.h
+++ b/Source/core/rendering/compositing/GraphicsLayerUpdater.h
@@ -38,7 +38,7 @@ class RenderView;
 
 class GraphicsLayerUpdater {
 public:
-    explicit GraphicsLayerUpdater(RenderView&);
+    GraphicsLayerUpdater();
     ~GraphicsLayerUpdater();
 
     enum UpdateType {
@@ -47,17 +47,10 @@ public:
     };
 
     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