1. @DomName('WebGL2RenderingContext.deleteTransformFeedback')
  2. @DocsEditable()
  3. @Experimental()
void deleteTransformFeedback(TransformFeedback feedback)

Source 

@DomName('WebGL2RenderingContext.deleteTransformFeedback')
@DocsEditable()
@Experimental() // untriaged
void deleteTransformFeedback(TransformFeedback feedback) =>
    _blink.BlinkWebGL2RenderingContext.instance
        .deleteTransformFeedback_Callback_1_(this, feedback);