[SyncFS] Fix unexpected delay on running sync task

chrome/browser/sync_file_system/drive_backend/sync_worker.cc

Index: chrome/browser/sync_file_system/drive_backend/sync_worker.cc
diff --git a/chrome/browser/sync_file_system/drive_backend/sync_worker.cc b/chrome/browser/sync_file_system/drive_backend/sync_worker.cc
index c754dbda1216cbf794223026f4f6fa300953ce2f..face293af5266cb266625e151f0984857f13c811 100644
--- a/chrome/browser/sync_file_system/drive_backend/sync_worker.cc
+++ b/chrome/browser/sync_file_system/drive_backend/sync_worker.cc
@@ -392,9 +392,12 @@ void SyncWorker::DidInitialize(SyncEngineInitializer* initializer,
 
   scoped_ptr<MetadataDatabase> metadata_database =
       initializer->PassMetadataDatabase();
-  if (metadata_database)
+  if (metadata_database) {
     context_->SetMetadataDatabase(metadata_database.Pass());
+    return;
+  }
 
+  UpdateServiceState(REMOTE_SERVICE_OK, std::string());
   UpdateRegisteredApps();
 }