[USS] Move GetAllNodes from backend to controller

components/sync/driver/frontend_data_type_controller.cc

Index: components/sync/driver/frontend_data_type_controller.cc
diff --git a/components/sync/driver/frontend_data_type_controller.cc b/components/sync/driver/frontend_data_type_controller.cc
index fbd9f8e6dbd5932251ed904984b6fd4dd8a5ce81..7d9ec0521d5787d438b5b1432dadd29f03ce7db3 100644
--- a/components/sync/driver/frontend_data_type_controller.cc
+++ b/components/sync/driver/frontend_data_type_controller.cc
@@ -21,8 +21,7 @@ FrontendDataTypeController::FrontendDataTypeController(
     const scoped_refptr<base::SingleThreadTaskRunner>& ui_thread,
     const base::Closure& error_callback,
     sync_driver::SyncClient* sync_client)
-    : DirectoryDataTypeController(ui_thread, error_callback),
-      sync_client_(sync_client),
+    : DirectoryDataTypeController(ui_thread, error_callback, sync_client),
       state_(NOT_RUNNING) {
   DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK(sync_client);
@@ -132,8 +131,8 @@ void FrontendDataTypeController::OnSingleDataTypeUnrecoverableError(
 
 FrontendDataTypeController::FrontendDataTypeController()
     : DirectoryDataTypeController(base::ThreadTaskRunnerHandle::Get(),
-                                  base::Closure()),
-      sync_client_(NULL),
+                                  base::Closure(),
+                                  nullptr),
       state_(NOT_RUNNING) {}
 
 FrontendDataTypeController::~FrontendDataTypeController() {