unvendorize(prop) {
    for (var i = 0, len = this.vendors.length; i < len; i++) {
      if ('official' != this.vendors[i]) {
        var vendor = '-' + this.vendors[i] + '-';
        if (~prop.indexOf(vendor)) return prop.replace(vendor, '');
      }
    }
    return prop;
  }
Return the property name without vendor prefix.

@param {String} prop
@return {String}
@api public