[DevTools] Replace ViewportControl with ListControl.

third_party/WebKit/Source/devtools/front_end/ui_lazy/CommandMenu.js

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 /**
  * @unrestricted
  */
 UI.CommandMenu = class {
   constructor() {
     this._commands = [];
     this._loadCommands();
@@ skipping 207 matching lines @@
     var index = String.hashCode(command.category()) % UI.CommandMenuDelegate.MaterialPaletteColors.length;
     tagElement.style.backgroundColor = UI.CommandMenuDelegate.MaterialPaletteColors[index];
     tagElement.textContent = command.category();
     titleElement.createTextChild(command.title());
     this.highlightRanges(titleElement, query);
     subtitleElement.textContent = command.shortcut();
   }
 
   /**
    * @override
-   * @param {number} itemIndex
+   * @param {?number} itemIndex
    * @param {string} promptValue
    */
   selectItem(itemIndex, promptValue) {
+    if (itemIndex === null)
+      return;
     this._commands[itemIndex].execute();
   }
 
   /**
    * @override
    * @return {boolean}
    */
   caseSensitive() {
     return false;
   }
@@ skipping 87 matching lines @@
    * @param {!UI.Context} context
    * @param {string} actionId
    * @return {boolean}
    */
   handleAction(context, actionId) {
     new UI.FilteredListWidget(new UI.CommandMenuDelegate()).showAsDialog();
     InspectorFrontendHost.bringToFront();
     return true;
   }
 };