DevTools: Add JSDoc for static methods, fix JSDoc types and induced errors

Source/devtools/front_end/components/InspectElementModeController.js

 /*
  * Copyright (C) 2013 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 17 matching lines @@
 
 /**
  * @constructor
  */
 WebInspector.InspectElementModeController = function()
 {
     this._toggleSearchButton = new WebInspector.StatusBarButton(WebInspector.UIString("Select an element in the page to inspect it."), "node-search-status-bar-item");
     this._shortcut = WebInspector.InspectElementModeController.createShortcut();
 }
 
+/**
+ * @return {!WebInspector.KeyboardShortcut.Descriptor}
+ */
 WebInspector.InspectElementModeController.createShortcut = function()
 {
     return WebInspector.KeyboardShortcut.makeDescriptor("c", WebInspector.KeyboardShortcut.Modifiers.CtrlOrMeta | WebInspector.KeyboardShortcut.Modifiers.Shift);
 }
 
 WebInspector.InspectElementModeController.prototype = {
     /**
      * @return {boolean}
      */
     enabled: function()
@@ skipping 55 matching lines @@
     {
         if (!WebInspector.inspectElementModeController)
             return null;
 
         return WebInspector.inspectElementModeController._toggleSearchButton;
     }
 }
 
 /** @type {?WebInspector.InspectElementModeController} */
 WebInspector.inspectElementModeController = null;