Revert "Remove OwnPtr from Blink."

third_party/WebKit/Source/core/layout/LayoutAnalyzer.h

 // 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.
 
 #ifndef LayoutAnalyzer_h
 #define LayoutAnalyzer_h
 
 #include "platform/LayoutUnit.h"
 #include "wtf/Allocator.h"
 #include "wtf/Noncopyable.h"
-#include <memory>
+#include "wtf/PassOwnPtr.h"
 
 namespace blink {
 
 class LayoutBlock;
 class LayoutObject;
 class TracedValue;
 
 // Observes the performance of layout and reports statistics via a TracedValue.
 // Usage:
 // LayoutAnalyzer::Scope analyzer(*this);
@@ skipping 53 matching lines @@
 
     void reset();
     void push(const LayoutObject&);
     void pop(const LayoutObject&);
 
     void increment(Counter counter, unsigned delta = 1)
     {
         m_counters[counter] += delta;
     }
 
-    std::unique_ptr<TracedValue> toTracedValue();
+    PassOwnPtr<TracedValue> toTracedValue();
 
 private:
     const char* nameForCounter(Counter) const;
 
     double m_startMs;
     unsigned m_depth;
     unsigned m_counters[NumCounters];
 };
 
 } // namespace blink
 
 #endif // LayoutAnalyzer_h