Remove OwnPtr from Blink.

third_party/WebKit/Source/web/ExternalPopupMenu.h

 /*
  * Copyright (C) 2010 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 20 matching lines @@
 #ifndef ExternalPopupMenu_h
 #define ExternalPopupMenu_h
 
 #include "platform/PopupMenu.h"
 #include "platform/Timer.h"
 #include "public/platform/WebCanvas.h"
 #include "public/platform/WebScrollbar.h"
 #include "public/web/WebExternalPopupMenuClient.h"
 #include "web/WebExport.h"
 #include "wtf/Compiler.h"
+#include <memory>
 
 namespace blink {
 
 class HTMLSelectElement;
 class LocalFrame;
 class WebExternalPopupMenu;
 class WebMouseEvent;
 class WebViewImpl;
 struct WebPopupMenuInfo;
 
@@ skipping 27 matching lines @@
     void didAcceptIndices(const WebVector<int>& indices) override;
     void didCancel() override;
 
     bool showInternal();
     void dispatchEvent(Timer<ExternalPopupMenu>*);
     void update();
 
     Member<HTMLSelectElement> m_ownerElement;
     Member<LocalFrame> m_localFrame;
     WebViewImpl& m_webView;
-    OwnPtr<WebMouseEvent> m_syntheticEvent;
+    std::unique_ptr<WebMouseEvent> m_syntheticEvent;
     Timer<ExternalPopupMenu> m_dispatchEventTimer;
     // The actual implementor of the show menu.
     WebExternalPopupMenu* m_webExternalPopupMenu;
     bool m_needsUpdate = false;
 };
 
 } // namespace blink
 
 #endif // ExternalPopupMenu_h