Devtools UI: Remove redundant tooltips

Source/devtools/front_end/resources/ResourcesPanel.js

 /*
  * Copyright (C) 2007, 2008, 2010 Apple Inc.  All rights reserved.
  * Copyright (C) 2009 Joseph Pecoraro
  * 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
@@ skipping 1166 matching lines @@
  * @param {!WebInspector.ResourcesPanel} storagePanel
  * @param {!WebInspector.Resource} resource
  */
 WebInspector.FrameResourceTreeElement = function(storagePanel, resource)
 {
     WebInspector.BaseStorageTreeElement.call(this, storagePanel, resource.displayName, ["resource-sidebar-tree-item", "resources-type-" + resource.resourceType().name()]);
     /** @type {!WebInspector.Resource} */
     this._resource = resource;
     this._resource.addEventListener(WebInspector.Resource.Events.MessageAdded, this._consoleMessageAdded, this);
     this._resource.addEventListener(WebInspector.Resource.Events.MessagesCleared, this._consoleMessagesCleared, this);
-    this.tooltip = resource.url;
+    WebInspector.Tooltip.install(this._listItemNode, resource.url);
     this._resource[WebInspector.FrameResourceTreeElement._symbol] = this;
 }
 
 WebInspector.FrameResourceTreeElement._symbol = Symbol("treeElement");
 
 WebInspector.FrameResourceTreeElement.prototype = {
     get itemURL()
     {
         return this._resource.url;
     },
@@ skipping 1217 matching lines @@
 WebInspector.ResourcesPanelFactory.prototype = {
     /**
      * @override
      * @return {!WebInspector.Panel}
      */
     createPanel: function()
     {
         return WebInspector.ResourcesPanel._instance();
     }
 }