Revert "Remove OwnPtr from Blink."

third_party/WebKit/Source/platform/TracedValue.h

 // Copyright 2014 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.
 
 #ifndef TracedValue_h
 #define TracedValue_h
 
 #include "base/memory/ref_counted.h"
 #include "platform/EventTracer.h"
+#include "wtf/PassOwnPtr.h"
 #include "wtf/text/WTFString.h"
-#include <memory>
 
 namespace base {
 namespace trace_event {
 class TracedValue;
 }
 }
 
 namespace blink {
 
 // TracedValue copies all passed names and values and doesn't retain references.
 class PLATFORM_EXPORT TracedValue final {
     WTF_MAKE_NONCOPYABLE(TracedValue);
 
 public:
     ~TracedValue();
 
-    static std::unique_ptr<TracedValue> create();
+    static PassOwnPtr<TracedValue> create();
 
     void endDictionary();
     void endArray();
 
     void setInteger(const char* name, int value);
     void setDouble(const char* name, double);
     void setBoolean(const char* name, bool value);
     void setString(const char* name, const String& value);
     void beginArray(const char* name);
     void beginDictionary(const char* name);
@@ skipping 13 matching lines @@
     // This will be moved (and become null) when TracedValue is passed to
     // EventTracer::addTraceEvent().
     std::unique_ptr<base::trace_event::TracedValue> m_tracedValue;
 
     friend class EventTracer;
 };
 
 } // namespace blink
 
 #endif // TracedValue_h