[DevTools] Make toolbar counters declarative.

Source/devtools/front_end/components/DockController.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 146 matching lines @@
             body.classList.remove("dock-to-bottom");
             break;
         }
     },
 
     __proto__: WebInspector.Object.prototype
 }
 
 /**
  * @constructor
- * @implements {WebInspector.StatusBarButton.Provider}
+ * @implements {WebInspector.StatusBarItem.Provider}
  */
 WebInspector.DockController.ButtonProvider = function()
 {
 }
 
 WebInspector.DockController.ButtonProvider.prototype = {
     /**
-     * @return {?WebInspector.StatusBarButton}
+     * @return {?WebInspector.StatusBarItem}
      */
-    button: function()
+    item: function()
     {
         if (!WebInspector.dockController.canDock())
             return null;
 
         if (!this._dockToggleButton) {
             this._dockToggleButton = new WebInspector.StatusBarStatesSettingButton(
                     "dock-status-bar-item",
                     WebInspector.dockController._states,
                     WebInspector.dockController._titles,
                     WebInspector.dockController.dockSide(),
                     WebInspector.settings.currentDockState,
                     WebInspector.settings.lastDockState,
                     WebInspector.dockController._dockSideChanged.bind(WebInspector.dockController));
         }
         return this._dockToggleButton;
     }
 }
 
 /**
  * @type {!WebInspector.DockController}
  */
 WebInspector.dockController;