[Sync] Services can now always assume processor exists.

components/sync/model/fake_model_type_change_processor.cc

Index: components/sync/model/fake_model_type_change_processor.cc
diff --git a/components/sync/model/fake_model_type_change_processor.cc b/components/sync/model/fake_model_type_change_processor.cc
index d1f62f032d78f154b9df462b8be5c07d9c0daa44..b4d3eacdf4fad27b61b8cc6940838c0226c43897 100644
--- a/components/sync/model/fake_model_type_change_processor.cc
+++ b/components/sync/model/fake_model_type_change_processor.cc
@@ -45,6 +45,10 @@ void FakeModelTypeChangeProcessor::OnSyncStarting(
 
 void FakeModelTypeChangeProcessor::DisableSync() {}
 
+bool FakeModelTypeChangeProcessor::IsTrackingMetadata() {
+  return true;
+}
+
 SyncError FakeModelTypeChangeProcessor::CreateAndUploadError(
     const tracked_objects::Location& location,
     const std::string& message) {