Convert //chrome/browser/extensions from scoped_ptr to std::unique_ptr

chrome/browser/extensions/external_pref_loader.h

 // Copyright (c) 2012 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 CHROME_BROWSER_EXTENSIONS_EXTERNAL_PREF_LOADER_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTERNAL_PREF_LOADER_H_
 
+#include <memory>
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/scoped_observer.h"
 #include "base/values.h"
 #include "chrome/browser/extensions/external_loader.h"
 #include "components/browser_sync/browser/profile_sync_service.h"
 #include "components/sync_driver/sync_service_observer.h"
 #include "components/syncable_prefs/pref_service_syncable_observer.h"
 
 class Profile;
 
 namespace syncable_prefs {
@@ skipping 105 matching lines @@
 
  protected:
   void StartLoading() override;
 
  private:
   friend class base::RefCountedThreadSafe<ExternalLoader>;
 
   ~ExternalTestingLoader() override;
 
   base::FilePath fake_base_path_;
-  scoped_ptr<base::DictionaryValue> testing_prefs_;
+  std::unique_ptr<base::DictionaryValue> testing_prefs_;
 
   DISALLOW_COPY_AND_ASSIGN(ExternalTestingLoader);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTERNAL_PREF_LOADER_H_