Move sync notifier contruction out of syncer thread.

chrome/browser/sync/glue/sync_backend_host.h

Index: chrome/browser/sync/glue/sync_backend_host.h
diff --git a/chrome/browser/sync/glue/sync_backend_host.h b/chrome/browser/sync/glue/sync_backend_host.h
index a6e6acfe812a155a5e7bb6840f4884a9590bb81c..04d14ff77c9915d3b9c33a901d986a4edd363b71 100644
--- a/chrome/browser/sync/glue/sync_backend_host.h
+++ b/chrome/browser/sync/glue/sync_backend_host.h
@@ -32,6 +32,10 @@
 class CancelableTask;
 class Profile;
 
+namespace sync_notifier {
+class SyncNotifier;
+}  // namespace sync_notifier
+
 namespace browser_sync {
 
 namespace sessions {
@@ -499,6 +503,8 @@ class SyncBackendHost : public browser_sync::ModelSafeWorkerRegistrar {
     // The top-level syncapi entry point.
     scoped_ptr<sync_api::SyncManager> syncapi_;
 
+    scoped_ptr<sync_notifier::SyncNotifier> sync_notifier_;
+
     JsSyncManagerObserver sync_manager_observer_;
 
     JsEventRouter* parent_router_;