Revert of [DevTools] Remove methods on Common.Event.

third_party/WebKit/Source/devtools/front_end/animation/AnimationTimeline.js

 // Copyright (c) 2015 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.
 /**
  * @implements {SDK.TargetManager.Observer}
  * @unrestricted
  */
 Animation.AnimationTimeline = class extends UI.VBox {
   constructor() {
     super(true);
@@ skipping 94 matching lines @@
     this._timelineScrubberLine = this._timelineScrubber.createChild('div', 'animation-scrubber-line');
     this._timelineScrubberLine.createChild('div', 'animation-scrubber-head');
     this._timelineScrubber.createChild('div', 'animation-time-overlay');
     return this._timelineScrubber;
   }
 
   _createHeader() {
     var toolbarContainer = this.contentElement.createChild('div', 'animation-timeline-toolbar-container');
     var topToolbar = new UI.Toolbar('animation-timeline-toolbar', toolbarContainer);
     var clearButton = new UI.ToolbarButton(Common.UIString('Clear all'), 'largeicon-clear');
-    clearButton.addEventListener(UI.ToolbarButton.Events.Click, this._reset.bind(this));
+    clearButton.addEventListener('click', this._reset.bind(this));
     topToolbar.appendToolbarItem(clearButton);
     topToolbar.appendSeparator();
 
     this._pauseButton = new UI.ToolbarToggle(Common.UIString('Pause all'), 'largeicon-pause', 'largeicon-resume');
     this._pauseButton.addEventListener('click', this._togglePauseAll.bind(this));
     topToolbar.appendToolbarItem(this._pauseButton);
 
     var playbackRateControl = toolbarContainer.createChild('div', 'animation-playback-rate-control');
     this._playbackRateButtons = [];
     for (var playbackRate of Animation.AnimationTimeline.GlobalPlaybackRates) {
@@ skipping 608 matching lines @@
   static parse(text) {
     var match = text.match(/^steps\((\d+), (start|middle)\)$/);
     if (match)
       return new Animation.AnimationTimeline.StepTimingFunction(parseInt(match[1], 10), match[2]);
     match = text.match(/^steps\((\d+)\)$/);
     if (match)
       return new Animation.AnimationTimeline.StepTimingFunction(parseInt(match[1], 10), 'end');
     return null;
   }
 };