Revert "Remove OwnPtr from Blink."

third_party/WebKit/Source/modules/mediasession/MediaSession.cpp

 // Copyright 2015 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.
 
 #include "modules/mediasession/MediaSession.h"
 
 #include "bindings/core/v8/CallbackPromiseAdapter.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "bindings/core/v8/ScriptState.h"
 #include "core/dom/DOMException.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/frame/LocalDOMWindow.h"
 #include "core/frame/LocalFrame.h"
 #include "core/loader/FrameLoaderClient.h"
 #include "modules/mediasession/MediaMetadata.h"
 #include "modules/mediasession/MediaSessionError.h"
-#include <memory>
 
 namespace blink {
 
-MediaSession::MediaSession(std::unique_ptr<WebMediaSession> webMediaSession)
+MediaSession::MediaSession(PassOwnPtr<WebMediaSession> webMediaSession)
     : m_webMediaSession(std::move(webMediaSession))
 {
     DCHECK(m_webMediaSession);
 }
 
 MediaSession* MediaSession::create(ExecutionContext* context, ExceptionState& exceptionState)
 {
     Document* document = toDocument(context);
     LocalFrame* frame = document->frame();
     FrameLoaderClient* client = frame->loader().client();
-    std::unique_ptr<WebMediaSession> webMediaSession = client->createWebMediaSession();
+    OwnPtr<WebMediaSession> webMediaSession = client->createWebMediaSession();
     if (!webMediaSession) {
         exceptionState.throwDOMException(NotSupportedError, "Missing platform implementation.");
         return nullptr;
     }
     return new MediaSession(std::move(webMediaSession));
 }
 
 ScriptPromise MediaSession::activate(ScriptState* scriptState)
 {
     ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
@@ skipping 27 matching lines @@
 {
     return m_metadata;
 }
 
 DEFINE_TRACE(MediaSession)
 {
     visitor->trace(m_metadata);
 }
 
 } // namespace blink