[Cleanup] Used scoped pointers in KeyedServiceFactory's SetTestingFactory functions.

chrome/browser/signin/fake_account_tracker_service.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 CHROME_BROWSER_SIGNIN_FAKE_ACCOUNT_TRACKER_SERVICE_H_
 #define CHROME_BROWSER_SIGNIN_FAKE_ACCOUNT_TRACKER_SERVICE_H_
 
+#include "base/memory/scoped_ptr.h"
 #include "components/signin/core/browser/account_tracker_service.h"
 
 class KeyedService;
 
 namespace content {
 class BrowserContext;
 }
 
 // AccountTrackerService is a KeyedService that retrieves and caches GAIA
 // information about Google Accounts.  This fake class can be used in tests
 // to prevent AccountTrackerService from sending network requests.
 class FakeAccountTrackerService : public AccountTrackerService {
  public:
-  static KeyedService* Build(content::BrowserContext* context);
+  static scoped_ptr<KeyedService> Build(content::BrowserContext* context);
 
   void FakeUserInfoFetchSuccess(const std::string& email,
                                 const std::string& gaia,
                                 const std::string& hosted_domain,
                                 const std::string& full_name,
                                 const std::string& given_name,
                                 const std::string& locale,
                                 const std::string& picture_url);
 
  private:
   FakeAccountTrackerService();
   ~FakeAccountTrackerService() override;
 
   void StartFetchingUserInfo(const std::string& account_id) override;
   void SendRefreshTokenAnnotationRequest(
       const std::string& account_id) override;
 
   DISALLOW_COPY_AND_ASSIGN(FakeAccountTrackerService);
 };
 
 #endif  // CHROME_BROWSER_SIGNIN_FAKE_ACCOUNT_TRACKER_SERVICE_H_