DevTools: get rid of getters and setters in StatusBarButton.

Source/devtools/front_end/resources/FileSystemView.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 32 matching lines @@
     this._directoryTree = new TreeOutline(directoryTreeElement);
     this.sidebarElement().appendChild(directoryTreeElement);
     this.sidebarElement().classList.add("outline-disclosure", "sidebar");
 
     var rootItem = new WebInspector.FileSystemView.EntryTreeElement(this, fileSystem.root);
     rootItem.expanded = true;
     this._directoryTree.appendChild(rootItem);
     this._visibleView = null;
 
     this._refreshButton = new WebInspector.StatusBarButton(WebInspector.UIString("Refresh"), "refresh-storage-status-bar-item");
-    this._refreshButton.visible = true;
+    this._refreshButton.setVisible(true);
     this._refreshButton.addEventListener("click", this._refresh, this);
 
     this._deleteButton = new WebInspector.StatusBarButton(WebInspector.UIString("Delete"), "delete-storage-status-bar-item");
-    this._deleteButton.visible = true;
+    this._deleteButton.setVisible(true);
     this._deleteButton.addEventListener("click", this._confirmDelete, this);
 }
 
 WebInspector.FileSystemView.prototype = {
     /**
      * @type {!Array.<!Element>}
      */
     get statusBarItems()
     {
         return [this._refreshButton.element, this._deleteButton.element];
@@ skipping 166 matching lines @@
     },
 
     _deletionCompleted: function()
     {
         if (this._entry != this._entry.fileSystem.root)
             this.parent.refresh();
     },
 
     __proto__: TreeElement.prototype
 }