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

third_party/WebKit/Source/devtools/front_end/sdk/ResourceTreeModel.js

 /*
  * Copyright (C) 2011 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 42 matching lines @@
 
     target.registerPageDispatcher(new WebInspector.PageDispatcher(this));
 
     this._pendingReloadOptions = null;
     this._reloadSuspensionCount = 0;
     this._fireExecutionContextOrderChanged = target.runtimeModel.fireExecutionContextOrderChanged.bind(target.runtimeModel);
 
     target.runtimeModel.setExecutionContextComparator(this._executionContextComparator.bind(this));
 }
 
+/** @enum {symbol} */
 WebInspector.ResourceTreeModel.EventTypes = {
-    FrameAdded: "FrameAdded",
-    FrameNavigated: "FrameNavigated",
-    FrameDetached: "FrameDetached",
-    FrameResized: "FrameResized",
-    FrameWillNavigate: "FrameWillNavigate",
-    MainFrameNavigated: "MainFrameNavigated",
-    ResourceAdded: "ResourceAdded",
-    WillLoadCachedResources: "WillLoadCachedResources",
-    CachedResourcesLoaded: "CachedResourcesLoaded",
-    DOMContentLoaded: "DOMContentLoaded",
-    Load: "Load",
-    PageReloadRequested: "PageReloadRequested",
-    WillReloadPage: "WillReloadPage",
-    ScreencastFrame: "ScreencastFrame",
-    ScreencastVisibilityChanged: "ScreencastVisibilityChanged",
-    ColorPicked: "ColorPicked",
-    InterstitialShown: "InterstitialShown",
-    InterstitialHidden: "InterstitialHidden"
+    FrameAdded: Symbol("FrameAdded"),
+    FrameNavigated: Symbol("FrameNavigated"),
+    FrameDetached: Symbol("FrameDetached"),
+    FrameResized: Symbol("FrameResized"),
+    FrameWillNavigate: Symbol("FrameWillNavigate"),
+    MainFrameNavigated: WebInspector.TargetManager.Events.MainFrameNavigated,
+    ResourceAdded: Symbol("ResourceAdded"),
+    WillLoadCachedResources: Symbol("WillLoadCachedResources"),
+    CachedResourcesLoaded: Symbol("CachedResourcesLoaded"),
+    DOMContentLoaded: Symbol("DOMContentLoaded"),
+    Load: WebInspector.TargetManager.Events.Load,
+    PageReloadRequested: WebInspector.TargetManager.Events.PageReloadRequested,
+    WillReloadPage: WebInspector.TargetManager.Events.WillReloadPage,
+    ScreencastFrame: Symbol("ScreencastFrame"),
+    ScreencastVisibilityChanged: Symbol("ScreencastVisibilityChanged"),
+    ColorPicked: Symbol("ColorPicked"),
+    InterstitialShown: Symbol("InterstitialShown"),
+    InterstitialHidden: Symbol("InterstitialHidden")
 }
 
 /**
  * @param {!WebInspector.Target} target
  * @return {?WebInspector.ResourceTreeModel}
  */
 WebInspector.ResourceTreeModel.fromTarget = function(target)
 {
     return /** @type {?WebInspector.ResourceTreeModel} */ (target.model(WebInspector.ResourceTreeModel));
 }
@@ skipping 842 matching lines @@
 
     /**
      * @override
      */
     navigationRequested: function()
     {
        // Frontend is not interested in when navigations are requested.
     }
 
 }