message: Remove methods that expose TfLiteEngine
diff: @@ -38,9 +38,6 @@ class BaseUntypedTaskApi {
  virtual ~BaseUntypedTaskApi() = default;
  - TfLiteEngine* GetTfLiteEngine() { return engine_.get(); }
  - const TfLiteEngine* GetTfLiteEngine() const { return engine_.get(); }
  -
  const metadata::ModelMetadataExtractor* GetMetadataExtractor() const {
  return engine_->metadata_extractor();
  }
  