[DevTools] Remove relativeToElement from Dialog.

Source/devtools/front_end/devices/DevicesDialog.js

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @constructor
  * @extends {WebInspector.DialogDelegate}
  */
 WebInspector.DevicesDialog = function()
 {
     WebInspector.DialogDelegate.call(this);
     this.element.classList.add("devices-dialog");
     this._view = new WebInspector.DevicesView();
     this._view.markAsRoot();
 
     this._closeButton = createElementWithClass("div", "dialog-close-button", "dt-close-button");
     this._closeButton.gray = true;
     this._closeButton.addEventListener("click", WebInspector.Dialog.hide.bind(WebInspector.Dialog), false);
     this.element.appendChild(this._closeButton);
 }
 
 /** @type {?WebInspector.DevicesDialog} */
 WebInspector.DevicesDialog._instance = null;
 
 WebInspector.DevicesDialog.show = function()
 {
     if (!WebInspector.DevicesDialog._instance)
         WebInspector.DevicesDialog._instance = new WebInspector.DevicesDialog();
-    WebInspector.Dialog.show(null, WebInspector.DevicesDialog._instance);
+    WebInspector.Dialog.show(WebInspector.DevicesDialog._instance);
 }
 
 WebInspector.DevicesDialog.prototype = {
     /**
      * @param {!Element} element
      * @override
      */
     show: function(element)
     {
         WebInspector.DialogDelegate.prototype.show.call(this, element);
@@ skipping 25 matching lines @@
      * @override
      * @param {!WebInspector.Context} context
      * @param {string} actionId
      */
     handleAction: function(context, actionId)
     {
         if (actionId === "devices.dialog.show")
             WebInspector.DevicesDialog.show();
     }
 }