Revert "Remove OwnPtr from Blink."

third_party/WebKit/Source/modules/webmidi/MIDIAccessor.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 16 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef MIDIAccessor_h
 #define MIDIAccessor_h
 
 #include "public/platform/modules/webmidi/WebMIDIAccessor.h"
 #include "public/platform/modules/webmidi/WebMIDIAccessorClient.h"
 #include "wtf/Allocator.h"
-#include <memory>
+#include "wtf/OwnPtr.h"
+#include "wtf/PassOwnPtr.h"
 
 namespace blink {
 
 class MIDIAccessorClient;
 
 class MIDIAccessor final : public WebMIDIAccessorClient {
     USING_FAST_MALLOC(MIDIAccessor);
 public:
-    static std::unique_ptr<MIDIAccessor> create(MIDIAccessorClient*);
+    static PassOwnPtr<MIDIAccessor> create(MIDIAccessorClient*);
 
     ~MIDIAccessor() override { }
 
     void startSession();
     void sendMIDIData(unsigned portIndex, const unsigned char* data, size_t length, double timeStamp);
     // MIDIAccessInitializer and MIDIAccess are both MIDIAccessClient.
     // MIDIAccessInitializer is the first client and MIDIAccess takes over it
     // once the initialization successfully finishes.
     void setClient(MIDIAccessorClient* client) { m_client = client; }
 
     // WebMIDIAccessorClient
     void didAddInputPort(const WebString& id, const WebString& manufacturer, const WebString& name, const WebString& version, MIDIPortState) override;
     void didAddOutputPort(const WebString& id, const WebString& manufacturer, const WebString& name, const WebString& version, MIDIPortState) override;
     void didSetInputPortState(unsigned portIndex, MIDIPortState) override;
     void didSetOutputPortState(unsigned portIndex, MIDIPortState) override;
     void didStartSession(bool success, const WebString& error, const WebString& message) override;
     void didReceiveMIDIData(unsigned portIndex, const unsigned char* data, size_t length, double timeStamp) override;
 
 private:
     explicit MIDIAccessor(MIDIAccessorClient*);
 
     MIDIAccessorClient* m_client;
-    std::unique_ptr<WebMIDIAccessor> m_accessor;
+    OwnPtr<WebMIDIAccessor> m_accessor;
 };
 
 } // namespace blink
 
 #endif // MIDIAccessor_h