DevTools: Use JS symbols instead of strings for eligible events.

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

 // Copyright (c) 2014 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.
 
 
 /**
  * @constructor
  * @extends {WebInspector.SDKModel}
  * @param {!WebInspector.Target} target
  */
 WebInspector.AnimationModel = function(target)
 {
     WebInspector.SDKModel.call(this, WebInspector.AnimationModel, target);
     this._agent = target.animationAgent();
     target.registerAnimationDispatcher(new WebInspector.AnimationDispatcher(this));
     /** @type {!Map.<string, !WebInspector.AnimationModel.Animation>} */
     this._animationsById = new Map();
     /** @type {!Map.<string, !WebInspector.AnimationModel.AnimationGroup>} */
     this._animationGroups = new Map();
     /** @type {!Array.<string>} */
     this._pendingAnimations = [];
     this._playbackRate = 1;
     target.resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.MainFrameNavigated, this._reset, this);
     this._screenshotCapture = new WebInspector.AnimationModel.ScreenshotCapture(target, this);
 }
 
+/** @enum {symbol} */
 WebInspector.AnimationModel.Events = {
-    AnimationGroupStarted: "AnimationGroupStarted",
-    ModelReset: "ModelReset"
+    AnimationGroupStarted: Symbol("AnimationGroupStarted"),
+    ModelReset: Symbol("ModelReset")
 }
 
 WebInspector.AnimationModel.prototype = {
     _reset: function()
     {
         this._animationsById.clear();
         this._animationGroups.clear();
         this._pendingAnimations = [];
         this.dispatchEventToListeners(WebInspector.AnimationModel.Events.ModelReset);
     },
@@ skipping 897 matching lines @@
         if (!this._capturing)
             return;
 
         delete this._stopTimer;
         delete this._endTime;
         this._requests = [];
         this._capturing = false;
         this._target.pageAgent().stopScreencast();
     }
 }