[Sync] Rename csync namespace to syncer

sync/internal_api/public/engine/model_safe_worker.h

Index: sync/internal_api/public/engine/model_safe_worker.h
diff --git a/sync/internal_api/public/engine/model_safe_worker.h b/sync/internal_api/public/engine/model_safe_worker.h
index e1d6563d14ea88ff9e7abb09dd768469a4b63261..a78a322e05a83a3df14c1f47ff277ecffc91f1d2 100644
--- a/sync/internal_api/public/engine/model_safe_worker.h
+++ b/sync/internal_api/public/engine/model_safe_worker.h
@@ -19,7 +19,7 @@ namespace base {
 class DictionaryValue;
 }  // namespace
 
-namespace csync {
+namespace syncer {
 
 typedef base::Callback<enum SyncerError(void)> WorkCallback;
 
@@ -82,6 +82,6 @@ syncable::ModelTypeSet GetRoutingInfoTypes(
 ModelSafeGroup GetGroupForModelType(const syncable::ModelType type,
                                     const ModelSafeRoutingInfo& routes);
 
-}  // namespace csync
+}  // namespace syncer
 
 #endif  // SYNC_INTERNAL_API_PUBLIC_ENGINE_MODEL_SAFE_WORKER_H_