Make NinePieceImageData use RefCountedCopyable.

third_party/WebKit/Source/core/style/NinePieceImage.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2005, 2006, 2007, 2008, 2013 Apple Inc. All rights
  * reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 25 matching lines @@
 
 namespace blink {
 
 enum ENinePieceImageRule {
   kStretchImageRule,
   kRoundImageRule,
   kSpaceImageRule,
   kRepeatImageRule
 };
 
-class CORE_EXPORT NinePieceImageData : public RefCounted<NinePieceImageData> {
+class CORE_EXPORT NinePieceImageData
+    : public RefCountedCopyable<NinePieceImageData> {
  public:
   static PassRefPtr<NinePieceImageData> Create() {
     return AdoptRef(new NinePieceImageData);
   }
   PassRefPtr<NinePieceImageData> Copy() const {
     return AdoptRef(new NinePieceImageData(*this));
   }
 
   bool operator==(const NinePieceImageData&) const;
   bool operator!=(const NinePieceImageData& o) const { return !(*this == o); }
 
   unsigned fill : 1;
   unsigned horizontal_rule : 2;  // ENinePieceImageRule
   unsigned vertical_rule : 2;    // ENinePieceImageRule
   Persistent<StyleImage> image;
   LengthBox image_slices;
   BorderImageLengthBox border_slices;
   BorderImageLengthBox outset;
 
  private:
   NinePieceImageData();
-  NinePieceImageData(const NinePieceImageData&);
+  NinePieceImageData(const NinePieceImageData&) = default;
 };
 
 class CORE_EXPORT NinePieceImage {
   DISALLOW_NEW();
 
  public:
   NinePieceImage();
   NinePieceImage(StyleImage*,
                  LengthBox image_slices,
                  bool fill,
@@ skipping 78 matching lines @@
     return LayoutUnit(outset_side.length().Value());
   }
 
  private:
   DataRef<NinePieceImageData> data_;
 };
 
 }  // namespace blink
 
 #endif  // NinePieceImage_h