sync: remove GetAuthenticatedUsername from ProfileSyncService/SyncBackendHost.

chrome/browser/sync/glue/sync_backend_host.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_BROWSER_SYNC_GLUE_SYNC_BACKEND_HOST_H_
 #define CHROME_BROWSER_SYNC_GLUE_SYNC_BACKEND_HOST_H_
 #pragma once
 
 #include <map>
 #include <string>
@@ skipping 217 matching lines @@
   // summarized form.
   Status GetDetailedStatus();
   StatusSummary GetStatusSummary();
   const GoogleServiceAuthError& GetAuthError() const;
   const sessions::SyncSessionSnapshot* GetLastSessionSnapshot() const;
 
   const FilePath& sync_data_folder_path() const {
     return sync_data_folder_path_;
   }
 
-  // Returns the authenticated username of the sync user, or empty if none
-  // exists. It will only exist if the authentication service provider (e.g
-  // GAIA) has confirmed the username is authentic.
-  string16 GetAuthenticatedUsername() const;
-
   // Determines if the underlying sync engine has made any local changes to
   // items that have not yet been synced with the server.
   // ONLY CALL THIS IF OnInitializationComplete was called!
   bool HasUnsyncedItems() const;
 
   // Whether or not we are syncing encryption keys.
   bool IsNigoriEnabled() const;
 
   // Whether or not the Nigori node is encrypted using an explicit passphrase.
   bool IsUsingExplicitPassphrase();
@@ skipping 352 matching lines @@
 
   // UI-thread cache of the last SyncSessionSnapshot received from syncapi.
   scoped_ptr<sessions::SyncSessionSnapshot> last_snapshot_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncBackendHost);
 };
 
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_GLUE_SYNC_BACKEND_HOST_H_