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

Source/devtools/front_end/sources/WatchExpressionsSidebarPane.js

 /*
  * Copyright (C) IBM Corp. 2009  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 326 matching lines @@
     _emptyElementContextMenu: function(event)
     {
         var contextMenu = new WebInspector.ContextMenu(event);
         contextMenu.appendItem(WebInspector.UIString(WebInspector.useLowerCaseMenuTitles() ? "Add watch expression" : "Add Watch Expression"), this.addNewExpressionAndEdit.bind(this));
         contextMenu.show();
     },
 
     __proto__: WebInspector.ObjectPropertiesSection.prototype
 }
 
+/**
+ * @param {!WebInspector.RemoteObjectProperty} propertyA
+ * @param {!WebInspector.RemoteObjectProperty} propertyB
+ * @return {number}
+ */
 WebInspector.WatchExpressionsSection.CompareProperties = function(propertyA, propertyB)
 {
     if (propertyA.watchIndex == propertyB.watchIndex)
         return 0;
     else if (propertyA.watchIndex < propertyB.watchIndex)
         return -1;
     else
         return 1;
 }
 
@@ skipping 151 matching lines @@
     },
 
     oncollapse: function()
     {
         WebInspector.ObjectPropertyTreeElement.prototype.oncollapse.call(this);
         delete this.treeOutline.section._expandedProperties[this.propertyPath()];
     },
 
     __proto__: WebInspector.ObjectPropertyTreeElement.prototype
 }