Revert "Remove OwnPtr from Blink."

third_party/WebKit/Source/platform/WaitableEvent.h

 /*
  * Copyright (C) 2014 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 14 matching lines @@
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (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 WaitableEvent_h
 #define WaitableEvent_h
 
 #include "platform/PlatformExport.h"
+#include "wtf/OwnPtr.h"
 #include "wtf/Vector.h"
-#include <memory>
 
 namespace base {
 class WaitableEvent;
 }; // namespace base
 
 namespace blink {
 
 // Provides a thread synchronization that can be used to allow one thread to
 // wait until another thread to finish some work.
 class PLATFORM_EXPORT WaitableEvent {
@@ skipping 24 matching lines @@
 
     // Waits on multiple events and returns the index of the object that
     // has been signaled. Any event objects given to this method must
     // not deleted while this wait is happening.
     static size_t waitMultiple(const WTF::Vector<WaitableEvent*>& events);
 
 private:
     WaitableEvent(const WaitableEvent&) = delete;
     void operator=(const WaitableEvent&) = delete;
 
-    std::unique_ptr<base::WaitableEvent> m_impl;
+    OwnPtr<base::WaitableEvent> m_impl;
 };
 
 } // namespace blink
 
 #endif // WaitableEvent_h