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

third_party/WebKit/Source/devtools/front_end/profiler/ProfilesPanel.js

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 27 matching lines @@
     /** @type {!Array.<!WebInspector.ProfileHeader>} */
     this._profiles = [];
     /** @type {?WebInspector.ProfileHeader} */
     this._profileBeingRecorded = null;
     this._nextProfileUid = 1;
 
     if (!window.opener)
         window.addEventListener("unload", this._clearTempStorage.bind(this), false);
 }
 
-/**
- * @enum {string}
- */
+/** @enum {symbol} */
 WebInspector.ProfileType.Events = {
-    AddProfileHeader: "add-profile-header",
-    ProfileComplete: "profile-complete",
-    RemoveProfileHeader: "remove-profile-header",
-    ViewUpdated: "view-updated"
+    AddProfileHeader: Symbol("add-profile-header"),
+    ProfileComplete: Symbol("profile-complete"),
+    RemoveProfileHeader: Symbol("remove-profile-header"),
+    ViewUpdated: Symbol("view-updated")
 }
 
 WebInspector.ProfileType.prototype = {
     /**
      * @return {string}
      */
     typeName: function()
     {
         return "";
     },
@@ skipping 258 matching lines @@
  * @param {boolean|undefined} wait
  */
 WebInspector.ProfileHeader.StatusUpdate = function(subtitle, wait)
 {
     /** @type {?string} */
     this.subtitle = subtitle;
     /** @type {boolean|undefined} */
     this.wait = wait;
 }
 
+/** @enum {symbol} */
 WebInspector.ProfileHeader.Events = {
-    UpdateStatus: "UpdateStatus",
-    ProfileReceived: "ProfileReceived"
+    UpdateStatus: Symbol("UpdateStatus"),
+    ProfileReceived: Symbol("ProfileReceived")
 }
 
 WebInspector.ProfileHeader.prototype = {
     /**
      * @return {?WebInspector.Target}
      */
     target: function()
     {
         return this._target;
     },
@@ skipping 939 matching lines @@
      * @return {boolean}
      */
     handleAction: function(context, actionId)
     {
         var panel = WebInspector.context.flavor(WebInspector.ProfilesPanel);
         console.assert(panel && panel instanceof WebInspector.ProfilesPanel);
         panel.toggleRecord();
         return true;
     }
 }