1. DomName('CSSStyleDeclaration.removeProperty')
  2. DocsEditable()
String removeProperty(String propertyName)

Source 

@DomName('CSSStyleDeclaration.removeProperty')
@DocsEditable()
String removeProperty(String propertyName) => _blink.BlinkCSSStyleDeclaration.instance.removeProperty_Callback_1_(unwrap_jso(this), propertyName);