[SPv2] Remove PaintArtifactCompositor::initializeIfNeeded.

third_party/WebKit/Source/platform/graphics/compositing/PaintArtifactCompositor.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PaintArtifactCompositor_h
 #define PaintArtifactCompositor_h
 
 #include "base/memory/ref_counted.h"
 #include "platform/PlatformExport.h"
 #include "wtf/Noncopyable.h"
@@ skipping 15 matching lines @@
 // changes in the paint artifact.
 //
 // PaintArtifactCompositor is the successor to PaintLayerCompositor, reflecting
 // the new home of compositing decisions after paint in Slimming Paint v2.
 class PLATFORM_EXPORT PaintArtifactCompositor {
     WTF_MAKE_NONCOPYABLE(PaintArtifactCompositor);
 public:
     PaintArtifactCompositor();
     ~PaintArtifactCompositor();
 
-    // Creates at least a root layer to be managed by this controller. Can't be
-    // done in the constructor, since RuntimeEnabledFeatures may not be
-    // initialized yet.
-    void initializeIfNeeded();
-
     // Updates the layer tree to match the provided paint artifact.
     // Creates the root layer if not already done.
     void update(const PaintArtifact&);
 
     // The root layer of the tree managed by this object.
     cc::Layer* rootLayer() const { return m_rootLayer.get(); }
 
     // Wraps rootLayer(), so that it can be attached as a child of another
     // WebLayer.
     WebLayer* webLayer() const { return m_webLayer.get(); }
 
 private:
     class ContentLayerClientImpl;
 
     scoped_refptr<cc::Layer> m_rootLayer;
     OwnPtr<WebLayer> m_webLayer;
     Vector<OwnPtr<ContentLayerClientImpl>> m_contentLayerClients;
 
     // For ~PaintArtifactCompositor on MSVC.
     friend struct WTF::OwnedPtrDeleter<ContentLayerClientImpl>;
 };
 
 } // namespace blink
 
 #endif // PaintArtifactCompositor_h