[Sync] Rename csync namespace to syncer

sync/internal_api/public/write_transaction.h

Index: sync/internal_api/public/write_transaction.h
diff --git a/sync/internal_api/public/write_transaction.h b/sync/internal_api/public/write_transaction.h
index b2de9a164ccfe254c7ded8f9b8b36b9f4827e5db..e72ae717b65bf6119f741b383e1ce1d723cae885 100644
--- a/sync/internal_api/public/write_transaction.h
+++ b/sync/internal_api/public/write_transaction.h
@@ -18,7 +18,7 @@ namespace tracked_objects {
 class Location;
 }  // namespace tracked_objects
 
-namespace csync {
+namespace syncer {
 
 // Sync API's WriteTransaction is a read/write BaseTransaction.  It wraps
 // a syncable::WriteTransaction.
@@ -52,6 +52,6 @@ class WriteTransaction : public BaseTransaction {
   DISALLOW_COPY_AND_ASSIGN(WriteTransaction);
 };
 
-} // namespace csync
+}  // namespace syncer
 
 #endif  // SYNC_INTERNAL_API_PUBLIC_WRITE_TRANSACTION_H_