[Sync] Refactor sync datatype error handling.

chrome/browser/sync/glue/extension_model_associator.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_EXTENSION_MODEL_ASSOCIATOR_H_
 #define CHROME_BROWSER_SYNC_GLUE_EXTENSION_MODEL_ASSOCIATOR_H_
 #pragma once
 
 #include "base/basictypes.h"
+#include "chrome/browser/sync/api/sync_error.h"
 #include "chrome/browser/sync/glue/extension_sync_traits.h"
 #include "chrome/browser/sync/glue/model_associator.h"
 #include "chrome/browser/sync/syncable/model_type.h"
 
 class ExtensionServiceInterface;
 
 namespace sync_api {
 struct UserShare;
 }  // namespace sync_api
 
 namespace browser_sync {
 
 // Contains all logic for associating the Chrome extensions model and
 // the sync extensions model.
 class ExtensionModelAssociator : public AssociatorInterface {
  public:
   // Does not take ownership of |extension_service| or |user_share|.
   ExtensionModelAssociator(ExtensionServiceInterface* extension_service,
                            sync_api::UserShare* user_share);
   virtual ~ExtensionModelAssociator();
 
   // Used by profile_sync_test_util.h.
   static syncable::ModelType model_type() { return syncable::EXTENSIONS; }
 
   // AssociatorInterface implementation.
-  virtual bool AssociateModels();
-  virtual bool DisassociateModels();
+  virtual bool AssociateModels(SyncError* error);
+  virtual bool DisassociateModels(SyncError* error);
   virtual bool SyncModelHasUserCreatedNodes(bool* has_nodes);
   virtual void AbortAssociation();
   virtual bool CryptoReadyIfNecessary();
  private:
   const ExtensionSyncTraits traits_;
   ExtensionServiceInterface* const extension_service_;
   sync_api::UserShare* const user_share_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionModelAssociator);
 };
 
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_GLUE_EXTENSION_MODEL_ASSOCIATOR_H_