sync: remove GetAuthenticatedUsername from ProfileSyncService/SyncBackendHost.

chrome/browser/sync/internal_api/sync_manager.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_INTERNAL_API_SYNC_MANAGER_H_
 #define CHROME_BROWSER_SYNC_INTERNAL_API_SYNC_MANAGER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 425 matching lines @@
             ChangeDelegate* change_delegate,
             const std::string& user_agent,
             const SyncCredentials& credentials,
             sync_notifier::SyncNotifier* sync_notifier,
             const std::string& restored_key_for_bootstrapping,
             bool setup_for_test_mode);
 
   // Checks if the sync server is reachable.
   void CheckServerReachable();
 
-  // Returns the username last used for a successful authentication.
-  // Returns empty if there is no such username.  May be called on any
-  // thread.
-  const std::string& GetAuthenticatedUsername();
-
   // Check if the database has been populated with a full "initial" download of
   // sync items for each data type currently present in the routing info.
   // Prerequisite for calling this is that OnInitializationComplete has been
   // called.  May be called from any thread.
   bool InitialSyncEndedForAllEnabledTypes();
 
   // Update tokens that we're using in Sync. Email must stay the same.
   void UpdateCredentials(const SyncCredentials& credentials);
 
   // Called when the user disables or enables a sync type.
@@ skipping 136 matching lines @@
 syncable::ModelTypeSet GetTypesWithEmptyProgressMarkerToken(
     const syncable::ModelTypeSet types,
     sync_api::UserShare* share);
 
 // Returns the string representation of a PassphraseRequiredReason value.
 std::string PassphraseRequiredReasonToString(PassphraseRequiredReason reason);
 
 }  // namespace sync_api
 
 #endif  // CHROME_BROWSER_SYNC_INTERNAL_API_SYNC_MANAGER_H_