Remove OwnPtr from Blink.

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

Index: third_party/WebKit/Source/modules/mediasession/MediaSession.cpp
diff --git a/third_party/WebKit/Source/modules/mediasession/MediaSession.cpp b/third_party/WebKit/Source/modules/mediasession/MediaSession.cpp
index feaab354c71d49276a48f5937afd2fc696a66604..102a88a8887eb74b49668d427828971edabd71ab 100644
--- a/third_party/WebKit/Source/modules/mediasession/MediaSession.cpp
+++ b/third_party/WebKit/Source/modules/mediasession/MediaSession.cpp
@@ -14,10 +14,11 @@
 #include "core/loader/FrameLoaderClient.h"
 #include "modules/mediasession/MediaMetadata.h"
 #include "modules/mediasession/MediaSessionError.h"
+#include <memory>
 
 namespace blink {
 
-MediaSession::MediaSession(PassOwnPtr<WebMediaSession> webMediaSession)
+MediaSession::MediaSession(std::unique_ptr<WebMediaSession> webMediaSession)
     : m_webMediaSession(std::move(webMediaSession))
 {
     ASSERT(m_webMediaSession);
@@ -28,7 +29,7 @@ MediaSession* MediaSession::create(ExecutionContext* context, ExceptionState& ex
     Document* document = toDocument(context);
     LocalFrame* frame = document->frame();
     FrameLoaderClient* client = frame->loader().client();
-    OwnPtr<WebMediaSession> webMediaSession = client->createWebMediaSession();
+    std::unique_ptr<WebMediaSession> webMediaSession = client->createWebMediaSession();
     if (!webMediaSession) {
         exceptionState.throwDOMException(NotSupportedError, "Missing platform implementation.");
         return nullptr;