[Sync] Move //components/sync to the syncer namespace, take 2.

components/sync/driver/data_type_manager_observer.h

Index: components/sync/driver/data_type_manager_observer.h
diff --git a/components/sync/driver/data_type_manager_observer.h b/components/sync/driver/data_type_manager_observer.h
index f6904b65e069315c0f46de98abe7b75d7732a28e..5135559cd551d4f439faa101ca8344e5ab4f7409 100644
--- a/components/sync/driver/data_type_manager_observer.h
+++ b/components/sync/driver/data_type_manager_observer.h
@@ -7,7 +7,7 @@
 
 #include "components/sync/driver/data_type_manager.h"
 
-namespace sync_driver {
+namespace syncer {
 
 // Various data type configuration events can be consumed by observing the
 // DataTypeManager through this interface.
@@ -21,6 +21,6 @@ class DataTypeManagerObserver {
   virtual ~DataTypeManagerObserver() {}
 };
 
-}  // namespace sync_driver
+}  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_DRIVER_DATA_TYPE_MANAGER_OBSERVER_H_