Remove obsolete friend declarations for MSVC.

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 40 matching lines @@
 
 private:
     class ContentLayerClientImpl;
 
     // Builds a leaf layer that represents a single paint chunk.
     scoped_refptr<cc::Layer> layerForPaintChunk(const PaintArtifact&, const PaintChunk&, gfx::Transform);
 
     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