[Sync] Rename csync namespace to syncer

sync/engine/traffic_recorder.cc

Index: sync/engine/traffic_recorder.cc
diff --git a/sync/engine/traffic_recorder.cc b/sync/engine/traffic_recorder.cc
index ade5bd6017b0d1f6cfa748cea65d0f26e2bd8bf6..379c488db8aaf41644172cc1f439802fe8c4645e 100644
--- a/sync/engine/traffic_recorder.cc
+++ b/sync/engine/traffic_recorder.cc
@@ -12,7 +12,7 @@
 #include "sync/protocol/sync.pb.h"
 #include "sync/sessions/sync_session.h"
 
-namespace csync {
+namespace syncer {
 
 TrafficRecorder::TrafficRecord::TrafficRecord(const std::string& message,
                                               TrafficMessageType message_type,
@@ -129,5 +129,5 @@ void TrafficRecorder::RecordClientToServerResponse(
   StoreProtoInQueue(response, CLIENT_TO_SERVER_RESPONSE);
 }
 
-}  // namespace csync
+}  // namespace syncer