1. @DomName('CanvasRenderingContext2D.removeHitRegion')
  2. @DocsEditable()
  3. @Experimental()
void removeHitRegion(String id)

Source 

@DomName('CanvasRenderingContext2D.removeHitRegion')
@DocsEditable()
@Experimental() // untriaged
void removeHitRegion(String id) =>
    _blink.BlinkCanvasRenderingContext2D.instance
        .removeHitRegion_Callback_1_(this, id);