[Sync] Rename csync namespace to syncer

sync/notifier/registration_manager.h

Index: sync/notifier/registration_manager.h
diff --git a/sync/notifier/registration_manager.h b/sync/notifier/registration_manager.h
index 45a066f406cfe465ff7f775259affdce55f92370..4f10287ccfdd14d3afce299ac417c4810de3ac14 100644
--- a/sync/notifier/registration_manager.h
+++ b/sync/notifier/registration_manager.h
@@ -20,7 +20,7 @@
 // For invalidation::InvalidationListener::RegistrationState.
 #include "google/cacheinvalidation/include/invalidation-listener.h"
 
-namespace csync {
+namespace syncer {
 
 using ::invalidation::InvalidationListener;
 
@@ -171,6 +171,6 @@ class RegistrationManager : public base::NonThreadSafe {
   DISALLOW_COPY_AND_ASSIGN(RegistrationManager);
 };
 
-}  // namespace csync
+}  // namespace syncer
 
 #endif  // SYNC_NOTIFIER_REGISTRATION_MANAGER_H_