[DevTools] Remove remaining usages of global properties.

Source/devtools/front_end/ui/ContextMenu.js

 /*
  * Copyright (C) 2009 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 276 matching lines @@
     },
 
     _innerShow: function()
     {
         var menuObject = this._buildDescriptor();
 
         if (menuObject.length) {
             WebInspector._contextMenu = this;
             if (WebInspector.ContextMenu._useSoftMenu || InspectorFrontendHost.isHostedMode()) {
                 var softMenu = new WebInspector.SoftContextMenu(menuObject, this._itemSelected.bind(this));
-                softMenu.show(this._x, this._y);
+                softMenu.show(this._event.target.ownerDocument, this._x, this._y);
             } else {
                 InspectorFrontendHost.showContextMenuAtPoint(this._x, this._y, menuObject);
                 InspectorFrontendHost.events.addEventListener(InspectorFrontendHostAPI.Events.ContextMenuCleared, this._menuCleared, this);
                 InspectorFrontendHost.events.addEventListener(InspectorFrontendHostAPI.Events.ContextMenuItemSelected, this._onItemSelected, this);
             }
         }
     },
 
     /**
      * @param {number} id
@@ skipping 59 matching lines @@
 }
 
 WebInspector.ContextMenu.Provider.prototype = {
     /**
      * @param {!Event} event
      * @param {!WebInspector.ContextMenu} contextMenu
      * @param {!Object} target
      */
     appendApplicableItems: function(event, contextMenu, target) { }
 }