[Sync] Refactor sync datatype error handling.

chrome/browser/sync/glue/session_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_SESSION_MODEL_ASSOCIATOR_H_
 #define CHROME_BROWSER_SYNC_GLUE_SESSION_MODEL_ASSOCIATOR_H_
 #pragma once
 
 #include <map>
 #include <string>
@@ skipping 99 matching lines @@
   virtual void Associate(const TabContentsWrapper* tab, int64 sync_id);
 
   // Looks up the specified sync node, and marks that tab as closed, then marks
   // the node as free and deletes association.
   virtual void Disassociate(int64 sync_id);
 
   // Load any foreign session info stored in sync db and update the sync db
   // with local client data. Processes/reuses any sync nodes owned by this
   // client and creates any further sync nodes needed to store local header and
   // tab info.
-  virtual bool AssociateModels();
+  virtual bool AssociateModels(SyncError* error);
 
   // Initializes the given sync node from the given chrome node id.
   // Returns false if no sync node was found for the given chrome node id or
   // if the initialization of sync node fails.
   virtual bool InitSyncNodeFromChromeId(const std::string& id,
                                         sync_api::BaseNode* sync_node);
 
   // Clear local sync data buffers. Does not delete sync nodes to avoid
   // tombstones. TODO(zea): way to eventually delete orphaned nodes.
-  virtual bool DisassociateModels();
+  virtual bool DisassociateModels(SyncError* error);
 
   // Returns the tag used to uniquely identify this machine's session in the
   // sync model.
   inline const std::string& GetCurrentMachineTag() {
     DCHECK(!current_machine_tag_.empty());
     return current_machine_tag_;
   }
 
   // Load and associate window and tab data for a foreign session
   bool AssociateForeignSpecifics(const sync_pb::SessionSpecifics& specifics,
@@ skipping 283 matching lines @@
   // is made.
   bool waiting_for_change_;
   ScopedRunnableMethodFactory<SessionModelAssociator> test_method_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SessionModelAssociator);
 };
 
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_GLUE_SESSION_MODEL_ASSOCIATOR_H_