Move sync notifier contruction out of syncer thread.

chrome/browser/sync/notifier/non_blocking_invalidation_notifier.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.
 //
 // An implementation of SyncNotifier that wraps InvalidationNotifier
 // on its own thread.
 
 #ifndef CHROME_BROWSER_SYNC_NOTIFIER_NON_BLOCKING_INVALIDATION_NOTIFIER_H_
 #define CHROME_BROWSER_SYNC_NOTIFIER_NON_BLOCKING_INVALIDATION_NOTIFIER_H_
 #pragma once
@@ skipping 75 matching lines @@
 
     DISALLOW_COPY_AND_ASSIGN(WorkerThreadVars);
   };
 
   MessageLoop* worker_message_loop();
 
   void CreateWorkerThreadVars(
       const notifier::NotifierOptions& notifier_options,
       const std::string& client_info);
   void DestroyWorkerThreadVars();
+  void CheckOrSetValidThread();
 
   // Equivalents of the public functions that are run on the worker
   // thread.
   void SetStateOnWorkerThread(const std::string& state);
   void UpdateCredentialsOnWorkerThread(const std::string& email,
                                        const std::string& token);
   void UpdateEnabledTypesOnWorkerThread(const syncable::ModelTypeSet& types);
 
-  MessageLoop* parent_message_loop_;
+  MessageLoop* construction_message_loop_;
+  MessageLoop* method_message_loop_;
 
   scoped_refptr<ObserverListThreadSafe<SyncNotifierObserver> > observers_;
 
   base::Thread worker_thread_;
   // Created and destroyed on the worker thread.  Not a scoped_ptr as
   // it's better to leak memory than to delete on the wrong thread.
   // Created by CreateWorkerThreadVars() and destroyed by
   // DestroyWorkerThreadVars().
   WorkerThreadVars* worker_thread_vars_;
 
   DISALLOW_COPY_AND_ASSIGN(NonBlockingInvalidationNotifier);
 };
 
 }  // namespace sync_notifier
 
 // We own our worker thread, so we don't need to be ref-counted.
 DISABLE_RUNNABLE_METHOD_REFCOUNT(
     sync_notifier::NonBlockingInvalidationNotifier);
 
 #endif  // CHROME_BROWSER_SYNC_NOTIFIER_NON_BLOCKING_INVALIDATION_NOTIFIER_H_