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

third_party/WebKit/Source/devtools/front_end/workspace/Workspace.js

 /*
  * Copyright (C) 2012 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 335 matching lines @@
  * @constructor
  * @extends {WebInspector.Object}
  */
 WebInspector.Workspace = function()
 {
     /** @type {!Map<string, !WebInspector.Project>} */
     this._projects = new Map();
     this._hasResourceContentTrackingExtensions = false;
 }
 
+/** @enum {symbol} */
 WebInspector.Workspace.Events = {
-    UISourceCodeAdded: "UISourceCodeAdded",
-    UISourceCodeRemoved: "UISourceCodeRemoved",
-    WorkingCopyChanged: "WorkingCopyChanged",
-    WorkingCopyCommitted: "WorkingCopyCommitted",
-    WorkingCopyCommittedByUser: "WorkingCopyCommittedByUser",
-    ProjectAdded: "ProjectAdded",
-    ProjectRemoved: "ProjectRemoved"
+    UISourceCodeAdded: Symbol("UISourceCodeAdded"),
+    UISourceCodeRemoved: Symbol("UISourceCodeRemoved"),
+    WorkingCopyChanged: Symbol("WorkingCopyChanged"),
+    WorkingCopyCommitted: Symbol("WorkingCopyCommitted"),
+    WorkingCopyCommittedByUser: Symbol("WorkingCopyCommittedByUser"),
+    ProjectAdded: Symbol("ProjectAdded"),
+    ProjectRemoved: Symbol("ProjectRemoved")
 }
 
 WebInspector.Workspace.prototype = {
     /**
      * @return {!Array.<!WebInspector.UISourceCode>}
      */
     unsavedSourceCodes: function()
     {
         /**
          * @param {!WebInspector.UISourceCode} sourceCode
@@ skipping 126 matching lines @@
         return this._hasResourceContentTrackingExtensions;
     },
 
     __proto__: WebInspector.Object.prototype
 }
 
 /**
  * @type {!WebInspector.Workspace}
  */
 WebInspector.workspace;