Revert "Remove OwnPtr from Blink."

third_party/WebKit/Source/modules/compositorworker/CompositorWorkerMessagingProxy.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 CompositorWorkerMessagingProxy_h
 #define CompositorWorkerMessagingProxy_h
 
 #include "core/workers/InProcessWorkerMessagingProxy.h"
 #include "wtf/Allocator.h"
-#include <memory>
 
 namespace blink {
 
 class CompositorWorkerMessagingProxy final : public InProcessWorkerMessagingProxy {
     USING_FAST_MALLOC(CompositorWorkerMessagingProxy);
 public:
     CompositorWorkerMessagingProxy(InProcessWorkerBase*, WorkerClients*);
 
 protected:
     ~CompositorWorkerMessagingProxy() override;
 
-    std::unique_ptr<WorkerThread> createWorkerThread(double originTime) override;
+    PassOwnPtr<WorkerThread> createWorkerThread(double originTime) override;
 };
 
 } // namespace blink
 
 #endif // CompositorWorkerMessagingProxy_h