[Sync] Refactored ProfileSyncService and remove its backend() function

chrome/browser/sync/glue/password_model_associator.h

 // Copyright (c) 2010 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_PASSWORD_MODEL_ASSOCIATOR_H_
 #define CHROME_BROWSER_SYNC_GLUE_PASSWORD_MODEL_ASSOCIATOR_H_
 #pragma once
 
 #include <map>
 #include <string>
@@ skipping 99 matching lines @@
   static bool MergePasswords(const sync_pb::PasswordSpecificsData& password,
                              const webkit_glue::PasswordForm& password_form,
                              webkit_glue::PasswordForm* new_password);
   static void WriteToSyncNode(const webkit_glue::PasswordForm& password_form,
                               sync_api::WriteNode* node);
 
   // Called at various points in model association to determine if the
   // user requested an abort.
   bool IsAbortPending();
 
- protected:
-  // Returns sync service instance.
-  ProfileSyncService* sync_service() { return sync_service_; }
-
  private:
   typedef std::map<std::string, int64> PasswordToSyncIdMap;
   typedef std::map<int64, std::string> SyncIdToPasswordMap;
 
   ProfileSyncService* sync_service_;
   PasswordStore* password_store_;
   int64 password_node_id_;
 
   // Abort association pending flag and lock.  If this is set to true
   // (via the AbortAssociation method), return from the
   // AssociateModels method as soon as possible.
   base::Lock abort_association_pending_lock_;
   bool abort_association_pending_;
 
   MessageLoop* expected_loop_;
 
   PasswordToSyncIdMap id_map_;
   SyncIdToPasswordMap id_map_inverse_;
 
   DISALLOW_COPY_AND_ASSIGN(PasswordModelAssociator);
 };
 
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_GLUE_PASSWORD_MODEL_ASSOCIATOR_H_