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

chrome/browser/extensions/api/web_navigation/web_navigation_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.
 
 // Defines the Chrome Extensions WebNavigation API functions for observing and
 // intercepting navigation events, as specified in the extension JSON API.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_API_WEB_NAVIGATION_WEB_NAVIGATION_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_WEB_NAVIGATION_WEB_NAVIGATION_API_H_
 
@@ skipping 192 matching lines @@
 
   content::BrowserContext* browser_context_;
 
   // BrowserContextKeyedAPI implementation.
   static const char* service_name() {
     return "WebNavigationAPI";
   }
   static const bool kServiceIsNULLWhileTesting = true;
 
   // Created lazily upon OnListenerAdded.
-  scoped_ptr<WebNavigationEventRouter> web_navigation_event_router_;
+  std::unique_ptr<WebNavigationEventRouter> web_navigation_event_router_;
 
   DISALLOW_COPY_AND_ASSIGN(WebNavigationAPI);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_WEB_NAVIGATION_WEB_NAVIGATION_API_H_