[Sync] Fix namespace for sync_driver component

components/sync_driver/failed_data_types_handler.cc

Index: components/sync_driver/failed_data_types_handler.cc
diff --git a/components/sync_driver/failed_data_types_handler.cc b/components/sync_driver/failed_data_types_handler.cc
index 058482dd317c17b98fe5ca481dd994e22b0aa8d6..cb18febac7f2f30b0abe80b6a4c0dde1a13a6c74 100644
--- a/components/sync_driver/failed_data_types_handler.cc
+++ b/components/sync_driver/failed_data_types_handler.cc
@@ -5,9 +5,7 @@
 #include "components/sync_driver/data_type_manager.h"
 #include "components/sync_driver/failed_data_types_handler.h"
 
-using browser_sync::DataTypeManager;
-
-namespace browser_sync {
+namespace sync_driver {
 
 namespace {
 
@@ -138,4 +136,4 @@ bool FailedDataTypesHandler::AnyFailedDataType() const {
          !crypto_errors_.empty();
 }
 
-}  // namespace browser_sync
+}  // namespace sync_driver