DevTools: migrate treeoutline from hasChildren to is/setExpandable().

Source/devtools/front_end/sources/NavigatorView.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:
  *
  * 1. Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *
@@ skipping 631 matching lines @@
     }
     return result;
 }
 
 /**
  * @constructor
  * @extends {TreeElement}
  * @param {string} type
  * @param {string} title
  * @param {!Array.<string>} iconClasses
- * @param {boolean} hasChildren
+ * @param {boolean} expandable
  * @param {boolean=} noIcon
  */
-WebInspector.BaseNavigatorTreeElement = function(type, title, iconClasses, hasChildren, noIcon)
+WebInspector.BaseNavigatorTreeElement = function(type, title, iconClasses, expandable, noIcon)
 {
     this._type = type;
-    TreeElement.call(this, "", hasChildren);
+    TreeElement.call(this, "", expandable);
     this._titleText = title;
     this._iconClasses = iconClasses;
     this._noIcon = noIcon;
 }
 
 WebInspector.BaseNavigatorTreeElement.prototype = {
     onattach: function()
     {
         this.listItemElement.removeChildren();
         if (this._iconClasses) {
@@ skipping 751 matching lines @@
 
     willRemoveChild: function(node)
     {
         if (node._isMerged || !this.isPopulated())
             return;
         this._treeElement.removeChild(node._treeElement);
     },
 
     __proto__: WebInspector.NavigatorTreeNode.prototype
 }