[Sync] Rename csync namespace to syncer

sync/test/engine/fake_model_worker.h

Index: sync/test/engine/fake_model_worker.h
diff --git a/sync/test/engine/fake_model_worker.h b/sync/test/engine/fake_model_worker.h
index b9ca42d5a86fdb556ceef6bcad9eee8ae9f7ecae..8b95fc5892224985e78f3d0c5f087f46512eb2bc 100644
--- a/sync/test/engine/fake_model_worker.h
+++ b/sync/test/engine/fake_model_worker.h
@@ -14,7 +14,7 @@
 #include "sync/internal_api/public/engine/model_safe_worker.h"
 #include "sync/internal_api/public/util/syncer_error.h"
 
-namespace csync {
+namespace syncer {
 
 // Fake implementation of ModelSafeWorker that does work on the
 // current thread regardless of the group.
@@ -35,7 +35,7 @@ class FakeModelWorker : public ModelSafeWorker, public base::NonThreadSafe {
   DISALLOW_COPY_AND_ASSIGN(FakeModelWorker);
 };
 
-}  // namespace csync
+}  // namespace syncer
 
 #endif  // SYNC_TEST_ENGINE_FAKE_MODEL_WORKER_H_