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

third_party/WebKit/Source/devtools/front_end/resources/DOMStorageModel.js

 /*
  * Copyright (C) 2008 Nokia Inc.  All rights reserved.
  * Copyright (C) 2013 Samsung Electronics. 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.
@@ skipping 33 matching lines @@
 /**
  * @param {string} securityOrigin
  * @param {boolean} isLocalStorage
  * @return {!DOMStorageAgent.StorageId}
  */
 WebInspector.DOMStorage.storageId = function(securityOrigin, isLocalStorage)
 {
     return { securityOrigin: securityOrigin, isLocalStorage: isLocalStorage };
 }
 
+/** @enum {symbol} */
 WebInspector.DOMStorage.Events = {
-    DOMStorageItemsCleared: "DOMStorageItemsCleared",
-    DOMStorageItemRemoved: "DOMStorageItemRemoved",
-    DOMStorageItemAdded: "DOMStorageItemAdded",
-    DOMStorageItemUpdated: "DOMStorageItemUpdated"
+    DOMStorageItemsCleared: Symbol("DOMStorageItemsCleared"),
+    DOMStorageItemRemoved: Symbol("DOMStorageItemRemoved"),
+    DOMStorageItemAdded: Symbol("DOMStorageItemAdded"),
+    DOMStorageItemUpdated: Symbol("DOMStorageItemUpdated")
 }
 
 WebInspector.DOMStorage.prototype = {
 
     /** @return {!DOMStorageAgent.StorageId} */
     get id()
     {
         return WebInspector.DOMStorage.storageId(this._securityOrigin, this._isLocalStorage);
     },
 
@@ skipping 46 matching lines @@
 WebInspector.DOMStorageModel = function(target, securityOriginManager)
 {
     WebInspector.SDKModel.call(this, WebInspector.DOMStorageModel, target);
 
     this._securityOriginManager = securityOriginManager;
     /** @type {!Object.<string, !WebInspector.DOMStorage>} */
     this._storages = {};
     this._agent = target.domstorageAgent();
 }
 
+/** @enum {symbol} */
 WebInspector.DOMStorageModel.Events = {
-    DOMStorageAdded: "DOMStorageAdded",
-    DOMStorageRemoved: "DOMStorageRemoved"
+    DOMStorageAdded: Symbol("DOMStorageAdded"),
+    DOMStorageRemoved: Symbol("DOMStorageRemoved")
 }
 
 WebInspector.DOMStorageModel.prototype = {
     enable: function()
     {
         if (this._enabled)
             return;
 
         this.target().registerDOMStorageDispatcher(new WebInspector.DOMStorageDispatcher(this));
         this._securityOriginManager.addEventListener(WebInspector.SecurityOriginManager.EventTypes.SecurityOriginAdded, this._securityOriginAdded, this);
@@ skipping 222 matching lines @@
  * @return {!WebInspector.DOMStorageModel}
  */
 WebInspector.DOMStorageModel.fromTarget = function(target)
 {
     var model = /** @type {?WebInspector.DOMStorageModel} */ (target.model(WebInspector.DOMStorageModel));
     if (!model) {
         model = new WebInspector.DOMStorageModel(target, WebInspector.SecurityOriginManager.fromTarget(target));
     }
     return model;
 }