[Sync] Rename csync namespace to syncer

sync/notifier/invalidation_state_tracker.h

Index: sync/notifier/invalidation_state_tracker.h
diff --git a/sync/notifier/invalidation_state_tracker.h b/sync/notifier/invalidation_state_tracker.h
index 9dbc352daa044cd89d34d7a97004d665e6156695..8f080fade20c80891d0a7431dcc123c9b1c28110 100644
--- a/sync/notifier/invalidation_state_tracker.h
+++ b/sync/notifier/invalidation_state_tracker.h
@@ -14,7 +14,7 @@
 #include "google/cacheinvalidation/include/types.h"
 #include "sync/notifier/invalidation_util.h"
 
-namespace csync {
+namespace syncer {
 
 typedef std::map<invalidation::ObjectId, int64, ObjectIdLessThan>
     InvalidationVersionMap;
@@ -41,6 +41,6 @@ class InvalidationStateTracker {
   virtual ~InvalidationStateTracker() {}
 };
 
-}  // namespace csync
+}  // namespace syncer
 
 #endif  // SYNC_NOTIFIER_INVALIDATION_STATE_TRACKER_H_