[Sync] Rename csync namespace to syncer

sync/engine/syncer_command.h

Index: sync/engine/syncer_command.h
diff --git a/sync/engine/syncer_command.h b/sync/engine/syncer_command.h
index 710b3acf633028eb5da5d7b122f3faa302d31472..b626b0f1dbbbd645fe2c6baa7c4db1c5b5ffc5c9 100644
--- a/sync/engine/syncer_command.h
+++ b/sync/engine/syncer_command.h
@@ -10,7 +10,7 @@
 
 #include "sync/internal_api/public/util/syncer_error.h"
 
-namespace csync {
+namespace syncer {
 
 namespace sessions {
 class SyncSession;
@@ -42,6 +42,6 @@ class SyncerCommand {
   DISALLOW_COPY_AND_ASSIGN(SyncerCommand);
 };
 
-}  // namespace csync
+}  // namespace syncer
 
 #endif  // SYNC_ENGINE_SYNCER_COMMAND_H_