Remove BrowserSignin, as it's not used anywhere.

chrome/browser/profiles/profile_impl.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.
 
 // This class gathers state related to a single user profile.
 
 #ifndef CHROME_BROWSER_PROFILES_PROFILE_IMPL_H_
 #define CHROME_BROWSER_PROFILES_PROFILE_IMPL_H_
 #pragma once
 
@@ skipping 104 matching lines @@
   virtual FilePath last_selected_directory();
   virtual void set_last_selected_directory(const FilePath& path);
   virtual ProfileSyncService* GetProfileSyncService();
   virtual ProfileSyncService* GetProfileSyncService(
       const std::string& cros_user);
   virtual TokenService* GetTokenService();
   void InitSyncService(const std::string& cros_user);
   virtual ChromeBlobStorageContext* GetBlobStorageContext();
   virtual ExtensionInfoMap* GetExtensionInfoMap();
   virtual PromoCounter* GetInstantPromoCounter();
-  virtual BrowserSignin* GetBrowserSignin();
   virtual ChromeURLDataManager* GetChromeURLDataManager();
 
 #if defined(OS_CHROMEOS)
   virtual void ChangeAppLocale(const std::string& locale, AppLocaleChangedVia);
   virtual void OnLogin();
   virtual void SetupChromeOSEnterpriseExtensionObserver();
   virtual void InitChromeOSPreferences();
 #endif  // defined(OS_CHROMEOS)
 
   virtual PrefProxyConfigTracker* GetProxyConfigTracker();
@@ skipping 96 matching lines @@
   scoped_refptr<DownloadManager> download_manager_;
   scoped_refptr<HistoryService> history_service_;
   scoped_refptr<FaviconService> favicon_service_;
   scoped_ptr<AutocompleteClassifier> autocomplete_classifier_;
   scoped_refptr<history::ShortcutsBackend> shortcuts_backend_;
   scoped_refptr<WebDataService> web_data_service_;
   scoped_refptr<PasswordStore> password_store_;
   scoped_refptr<WebKitContext> webkit_context_;
   scoped_refptr<PersonalDataManager> personal_data_manager_;
   scoped_refptr<fileapi::FileSystemContext> file_system_context_;
-  scoped_ptr<BrowserSignin> browser_signin_;
   scoped_refptr<quota::QuotaManager> quota_manager_;
   bool history_service_created_;
   bool favicon_service_created_;
   bool created_web_data_service_;
   bool created_password_store_;
   bool created_download_manager_;
   bool clear_local_state_on_exit_;
   // Whether or not the last session exited cleanly. This is set only once.
   bool last_session_exited_cleanly_;
 
@@ skipping 37 matching lines @@
   scoped_refptr<PrefProxyConfigTracker> pref_proxy_config_tracker_;
 
   scoped_ptr<ChromeURLDataManager> chrome_url_data_manager_;
 
   Profile::Delegate* delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileImpl);
 };
 
 #endif  // CHROME_BROWSER_PROFILES_PROFILE_IMPL_H_