Revert of [Sync] Stop accessing BrowserContextKeyedServiceFactory on non-UI thread.

components/sync/driver/fake_generic_change_processor.cc

Index: components/sync/driver/fake_generic_change_processor.cc
diff --git a/components/sync/driver/fake_generic_change_processor.cc b/components/sync/driver/fake_generic_change_processor.cc
index 59f94d55131fb18a426291067f0c03f24a488a23..358b141677b5a9c17a2f5955495b5f65364a9256 100644
--- a/components/sync/driver/fake_generic_change_processor.cc
+++ b/components/sync/driver/fake_generic_change_processor.cc
@@ -12,13 +12,14 @@
 
 namespace syncer {
 
-FakeGenericChangeProcessor::FakeGenericChangeProcessor(ModelType type)
+FakeGenericChangeProcessor::FakeGenericChangeProcessor(ModelType type,
+                                                       SyncClient* sync_client)
     : GenericChangeProcessor(type,
                              nullptr,
                              base::WeakPtr<SyncableService>(),
                              base::WeakPtr<SyncMergeResult>(),
                              nullptr,
-                             nullptr,
+                             sync_client,
                              nullptr),
       sync_model_has_user_created_nodes_(true),
       sync_model_has_user_created_nodes_success_(true) {}
@@ -76,7 +77,7 @@
     std::unique_ptr<DataTypeErrorHandler> error_handler,
     const base::WeakPtr<SyncableService>& local_service,
     const base::WeakPtr<SyncMergeResult>& merge_result,
-    SyncApiComponentFactory* driver_factory) {
+    SyncClient* sync_client) {
   return std::move(processor_);
 }