Revert "Remove OwnPtr from Blink."

third_party/WebKit/Source/modules/encryptedmedia/MediaKeySystemAccess.h

 // Copyright 2014 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 MediaKeySystemAccess_h
 #define MediaKeySystemAccess_h
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "modules/encryptedmedia/MediaKeySystemConfiguration.h"
 #include "public/platform/WebContentDecryptionModuleAccess.h"
 #include "wtf/Forward.h"
-#include <memory>
 
 namespace blink {
 
 class MediaKeySystemAccess final : public GarbageCollectedFinalized<MediaKeySystemAccess>, public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
 
 public:
-    MediaKeySystemAccess(const String& keySystem, std::unique_ptr<WebContentDecryptionModuleAccess>);
+    MediaKeySystemAccess(const String& keySystem, PassOwnPtr<WebContentDecryptionModuleAccess>);
     virtual ~MediaKeySystemAccess();
 
     const String& keySystem() const { return m_keySystem; }
     void getConfiguration(MediaKeySystemConfiguration& result);
     ScriptPromise createMediaKeys(ScriptState*);
 
     DECLARE_TRACE();
 
 private:
     const String m_keySystem;
-    std::unique_ptr<WebContentDecryptionModuleAccess> m_access;
+    OwnPtr<WebContentDecryptionModuleAccess> m_access;
 };
 
 } // namespace blink
 
 #endif // MediaKeySystemAccess_h