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

extensions/browser/api/dns/dns_api.h

 // Copyright 2014 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 EXTENSIONS_BROWSER_API_DNS_DNS_API_H_
 #define EXTENSIONS_BROWSER_API_DNS_DNS_API_H_
 
 #include <string>
 
 #include "extensions/browser/extension_function.h"
@@ skipping 25 matching lines @@
  private:
   void OnLookupFinished(int result);
 
   std::string hostname_;
 
   // Not owned.
   content::ResourceContext* resource_context_;
 
   bool response_;  // The value sent in SendResponse().
 
-  scoped_ptr<net::HostResolver::RequestHandle> request_handle_;
-  scoped_ptr<net::AddressList> addresses_;
+  std::unique_ptr<net::HostResolver::RequestHandle> request_handle_;
+  std::unique_ptr<net::AddressList> addresses_;
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_API_DNS_DNS_API_H_