Revert "Remove OwnPtr from Blink."

third_party/WebKit/Source/platform/graphics/CanvasSurfaceLayerBridge.h

 // Copyright 2016 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 CanvasSurfaceLayerBridge_h
 #define CanvasSurfaceLayerBridge_h
 
 #include "base/memory/ref_counted.h"
 #include "platform/PlatformExport.h"
-#include <memory>
+#include "wtf/OwnPtr.h"
 
 namespace cc {
 // TODO(611796): replace SolidColorLayer with SurfaceLayer
 class SolidColorLayer;
 }
 
 namespace blink {
 
 class WebLayer;
 
 class PLATFORM_EXPORT CanvasSurfaceLayerBridge {
 public:
     explicit CanvasSurfaceLayerBridge();
     ~CanvasSurfaceLayerBridge();
     WebLayer* getWebLayer() const { return m_webLayer.get(); }
 
 private:
     scoped_refptr<cc::SolidColorLayer> m_solidColorLayer;
-    std::unique_ptr<WebLayer> m_webLayer;
+    OwnPtr<WebLayer> m_webLayer;
 };
 
 }
 
 #endif // CanvasSurfaceLayerBridge