Move sync notifier contruction out of syncer thread.

chrome/browser/sync/notifier/non_blocking_invalidation_notifier.h

Index: chrome/browser/sync/notifier/non_blocking_invalidation_notifier.h
diff --git a/chrome/browser/sync/notifier/non_blocking_invalidation_notifier.h b/chrome/browser/sync/notifier/non_blocking_invalidation_notifier.h
index dfb7b4c2eaf3a1dbd0088e88625c6f828f57154a..4b6b3fdc5890832dc7f517b04528b2c34d44fe3e 100644
--- a/chrome/browser/sync/notifier/non_blocking_invalidation_notifier.h
+++ b/chrome/browser/sync/notifier/non_blocking_invalidation_notifier.h
@@ -93,6 +93,7 @@ class NonBlockingInvalidationNotifier : public SyncNotifier {
       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.
@@ -101,7 +102,8 @@ class NonBlockingInvalidationNotifier : public SyncNotifier {
                                        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_;