Remove BrowserSignin, as it's not used anywhere.

chrome/test/base/testing_profile.h

 // Copyright (c) 2011 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_TEST_BASE_TESTING_PROFILE_H_
 #define CHROME_TEST_BASE_TESTING_PROFILE_H_
 #pragma once
 
 #include <string>
 
@@ skipping 168 matching lines @@
   void SetPrefService(PrefService* prefs);
   virtual PrefService* GetPrefs();
   virtual TemplateURLFetcher* GetTemplateURLFetcher();
   virtual history::TopSites* GetTopSites();
   virtual history::TopSites* GetTopSitesWithoutCreating();
   virtual DownloadManager* GetDownloadManager();
   virtual PersonalDataManager* GetPersonalDataManager();
   virtual fileapi::FileSystemContext* GetFileSystemContext();
   virtual void SetQuotaManager(quota::QuotaManager* manager);
   virtual quota::QuotaManager* GetQuotaManager();
-  virtual BrowserSignin* GetBrowserSignin();
   virtual bool HasCreatedDownloadManager() const;
 
   // Returns a testing ContextGetter (if one has been created via
   // CreateRequestContext) or NULL. This is not done on-demand for two reasons:
   // (1) Some tests depend on GetRequestContext() returning NULL. (2) Because
   // of the special memory management considerations for the
   // TestURLRequestContextGetter class, many tests would find themseleves
   // leaking if they called this method without the necessary IO thread. This
   // getter is currently only capable of returning a Context that helps test
   // the CookieMonster. See implementation comments for more details.
@@ skipping 190 matching lines @@
   // testing.
   ProfileDependencyManager* profile_dependency_manager_;
 
   scoped_refptr<ChromeAppCacheService> appcache_service_;
 
   // The QuotaManager, only available if set explicitly via SetQuotaManager.
   scoped_refptr<quota::QuotaManager> quota_manager_;
 };
 
 #endif  // CHROME_TEST_BASE_TESTING_PROFILE_H_