Revert "Remove OwnPtr from Blink."

third_party/WebKit/Source/platform/graphics/CompositorMutatorClient.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 CompositorMutatorClient_h
 #define CompositorMutatorClient_h
 
 #include "platform/PlatformExport.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/WebCompositorMutatorClient.h"
-#include <memory>
+#include "wtf/OwnPtr.h"
+#include "wtf/PassOwnPtr.h"
 
 namespace blink {
 
 class CompositorMutator;
 struct CompositorMutations;
 class CompositorMutationsTarget;
 
 class PLATFORM_EXPORT CompositorMutatorClient : public WebCompositorMutatorClient {
 public:
     CompositorMutatorClient(CompositorMutator*, CompositorMutationsTarget*);
     virtual ~CompositorMutatorClient();
 
     void setNeedsMutate();
 
     // cc::LayerTreeMutator
     bool Mutate(base::TimeTicks monotonicTime, cc::LayerTreeImpl*) override;
     void SetClient(cc::LayerTreeMutatorClient*) override;
     base::Closure TakeMutations() override;
 
     CompositorMutator* mutator() { return m_mutator.get(); }
 
-    void setMutationsForTesting(std::unique_ptr<CompositorMutations>);
+    void setMutationsForTesting(PassOwnPtr<CompositorMutations>);
 private:
     cc::LayerTreeMutatorClient* m_client;
     CompositorMutationsTarget* m_mutationsTarget;
     Persistent<CompositorMutator> m_mutator;
-    std::unique_ptr<CompositorMutations> m_mutations;
+    OwnPtr<CompositorMutations> m_mutations;
 };
 
 } // namespace blink
 
 #endif // CompositorMutatorClient_h