Revert of [Sync] Make directory types registration explicit in ModelTypeRegistry

components/sync/driver/model_type_controller.cc

Index: components/sync/driver/model_type_controller.cc
diff --git a/components/sync/driver/model_type_controller.cc b/components/sync/driver/model_type_controller.cc
index c85cf6ceedf92eda074af65c47d7ad2fbc2b5970..b0d28cf087cf72346d312fa894b5625b02ed746e 100644
--- a/components/sync/driver/model_type_controller.cc
+++ b/components/sync/driver/model_type_controller.cc
@@ -127,7 +127,18 @@
                             std::move(error_handler), std::move(callback)));
 }
 
-void ModelTypeController::BeforeLoadModels(ModelTypeConfigurer* configurer) {}
+void ModelTypeController::GetAllNodes(const AllNodesCallback& callback) {
+  model_thread_->PostTask(
+      FROM_HERE, base::Bind(&CallGetAllNodesHelper, sync_client_, type(),
+                            BindToCurrentThread(callback)));
+}
+
+void ModelTypeController::GetStatusCounters(
+    const StatusCountersCallback& callback) {
+  model_thread_->PostTask(
+      FROM_HERE,
+      base::Bind(&CallGetStatusCountersHelper, sync_client_, type(), callback));
+}
 
 void ModelTypeController::LoadModelsDone(ConfigureResult result,
                                          const SyncError& error) {
@@ -242,19 +253,6 @@
   return state_;
 }
 
-void ModelTypeController::GetAllNodes(const AllNodesCallback& callback) {
-  model_thread_->PostTask(
-      FROM_HERE, base::Bind(&CallGetAllNodesHelper, sync_client_, type(),
-                            BindToCurrentThread(callback)));
-}
-
-void ModelTypeController::GetStatusCounters(
-    const StatusCountersCallback& callback) {
-  model_thread_->PostTask(
-      FROM_HERE,
-      base::Bind(&CallGetStatusCountersHelper, sync_client_, type(), callback));
-}
-
 void ModelTypeController::ReportModelError(const ModelError& error) {
   DCHECK(CalledOnValidThread());
   LoadModelsDone(UNRECOVERABLE_ERROR,