removeStyleEntries method
Implementation
List<CSSEntry> removeStyleEntries(List<String> names) {
  if (names.isEmpty) return <CSSEntry>[];
  var style = this.style;
  var removed = <CSSEntry>[];
  for (var name in names) {
    var entry = style.removeEntry(name);
    if (entry != null) {
      removed.add(entry);
    }
  }
  this.style = style;
  return removed;
}