[USS] Move GetAllNodes from backend to controller

components/sync/driver/non_blocking_data_type_controller.cc

Index: components/sync/driver/non_blocking_data_type_controller.cc
diff --git a/components/sync/driver/non_blocking_data_type_controller.cc b/components/sync/driver/non_blocking_data_type_controller.cc
index 4d293c8ff827c6d90b3dece83f8a9e518cf4d948..0ead4150a336a15c43c545e9b58be13fbe5e4721 100644
--- a/components/sync/driver/non_blocking_data_type_controller.cc
+++ b/components/sync/driver/non_blocking_data_type_controller.cc
@@ -9,6 +9,7 @@
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/location.h"
+#include "base/memory/ptr_util.h"
 #include "base/single_thread_task_runner.h"
 #include "components/sync/api/model_type_change_processor.h"
 #include "components/sync/api/model_type_service.h"
@@ -78,6 +79,11 @@ void NonBlockingDataTypeController::LoadModels(
   }
 }
 
+void NonBlockingDataTypeController::GetAllNodes(
+    const AllNodesCallback& callback) {
+  callback.Run(type(), base::WrapUnique(new base::ListValue()));
+}
+
 void NonBlockingDataTypeController::LoadModelsDone(
     ConfigureResult result,
     const syncer::SyncError& error) {