Revert "Remove OwnPtr from Blink."

third_party/WebKit/Source/platform/testing/weburl_loader_mock.h

 // Copyright 2016 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 WebURLLoaderMock_h
 #define WebURLLoaderMock_h
 
 #include "base/macros.h"
 #include "public/platform/WebURLLoader.h"
+#include "wtf/OwnPtr.h"
 #include "wtf/WeakPtr.h"
-#include <memory>
 
 namespace blink {
 
 class WebData;
 struct WebURLError;
 class WebURLLoaderClient;
 class WebURLLoaderMockFactoryImpl;
 class WebURLLoaderTestDelegate;
 class WebURLRequest;
 class WebURLResponse;
@@ skipping 32 matching lines @@
   void setLoadingTaskRunner(WebTaskRunner*) override;
 
   bool is_deferred() { return is_deferred_; }
   bool is_cancelled() { return !client_; }
 
   WeakPtr<WebURLLoaderMock> GetWeakPtr();
 
  private:
   WebURLLoaderMockFactoryImpl* factory_ = nullptr;
   WebURLLoaderClient* client_ = nullptr;
-  std::unique_ptr<WebURLLoader> default_loader_;
+  OwnPtr<WebURLLoader> default_loader_;
   bool using_default_loader_ = false;
   bool is_deferred_ = false;
 
   WeakPtrFactory<WebURLLoaderMock> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WebURLLoaderMock);
 };
 
 } // namespace blink
 
 #endif  // WebURLLoaderMock_h