update3dRenderingContext is 13.5% of GraphicsLayerUpdater::rebuildTree

Source/core/rendering/RenderLayer.h

Index: Source/core/rendering/RenderLayer.h
diff --git a/Source/core/rendering/RenderLayer.h b/Source/core/rendering/RenderLayer.h
index 554a48e625f2986fff9be7d9584c3596948fb0e8..f8b960b6342f774a86339cd3116898bf55be8c30 100644
--- a/Source/core/rendering/RenderLayer.h
+++ b/Source/core/rendering/RenderLayer.h
@@ -191,8 +191,7 @@ public:
     RenderLayer* enclosingPaginationLayer() const { return m_enclosingPaginationLayer; }
 
     void updateTransform();
-    void update3dRenderingContext();
-    RenderLayer* renderingContextRoot() const { return m_3dRenderingContextRoot; }
+    RenderLayer* renderingContextRoot();
 
     const LayoutSize& offsetForInFlowPosition() const { return m_offsetForInFlowPosition; }
 
@@ -744,10 +743,6 @@ private:
     // Pointer to the enclosing RenderLayer that caused us to be paginated. It is 0 if we are not paginated.
     RenderLayer* m_enclosingPaginationLayer;
 
-    // Pointer to the enclosing RenderLayer that establishes the 3d rendering context in which this layer participates.
-    // If it 0, it does not participate in a 3d rendering context.
-    RenderLayer* m_3dRenderingContextRoot;
-
     // Properties that are computed while updating compositing layers. These values may be dirty/invalid if
     // compositing status is not up-to-date before using them.
     struct CompositingProperties {