[Sync] Services can now always assume processor exists.

components/sync/model/fake_model_type_change_processor.h

Index: components/sync/model/fake_model_type_change_processor.h
diff --git a/components/sync/model/fake_model_type_change_processor.h b/components/sync/model/fake_model_type_change_processor.h
index 9efc28401a9ab12ce4c4d384b6f9642728475354..4061a89790b9ccacd35b486dd95692d1eb87faa3 100644
--- a/components/sync/model/fake_model_type_change_processor.h
+++ b/components/sync/model/fake_model_type_change_processor.h
@@ -37,6 +37,7 @@ class FakeModelTypeChangeProcessor : public ModelTypeChangeProcessor {
   void OnSyncStarting(std::unique_ptr<DataTypeErrorHandler> error_handler,
                       const StartCallback& callback) override;
   void DisableSync() override;
+  bool IsTrackingMetadata() override;
   SyncError CreateAndUploadError(const tracked_objects::Location& location,
                                  const std::string& message) override;
 };