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

chrome/browser/extensions/api/preference/preference_api.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_API_PREFERENCE_PREFERENCE_API_H__
 #define CHROME_BROWSER_EXTENSIONS_API_PREFERENCE_PREFERENCE_API_H__
 
 #include <string>
 
 #include "base/macros.h"
@@ skipping 118 matching lines @@
   Profile* profile_;
 
   // BrowserContextKeyedAPI implementation.
   static const char* service_name() {
     return "PreferenceAPI";
   }
   static const bool kServiceIsNULLWhileTesting = true;
   static const bool kServiceRedirectedInIncognito = true;
 
   // Created lazily upon OnListenerAdded.
-  scoped_ptr<PreferenceEventRouter> preference_event_router_;
+  std::unique_ptr<PreferenceEventRouter> preference_event_router_;
 
   DISALLOW_COPY_AND_ASSIGN(PreferenceAPI);
 };
 
 class PrefTransformerInterface {
  public:
   virtual ~PrefTransformerInterface() {}
 
   // Converts the representation of a preference as seen by the extension
   // into a representation that is used in the pref stores of the browser.
@@ skipping 62 matching lines @@
  protected:
   ~ClearPreferenceFunction() override;
 
   // ExtensionFunction:
   bool RunSync() override;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_PREFERENCE_PREFERENCE_API_H__