createAutoComplete_() {
    var matcher = new goog.ui.ac.ArrayMatcher(this.allUids_, false);
    var renderer = new goog.ui.ac.Renderer();
    var inputHandler = new panels.ChipHolderInputHandler(
        goog.bind(this.handleNewChipValue_, this));
    var autoComplete =
        new goog.ui.ac.AutoComplete(matcher, renderer, inputHandler);
    inputHandler.attachAutoComplete(autoComplete);
    inputHandler.attachInputs(this.shadowInputElem_);
    return autoComplete;
  }
Factory function for building an autocomplete widget for the Chips.
@return {!goog.ui.ac.AutoComplete} A new autocomplete object.
@private