[DevTools] Remove relativeToElement from Dialog.

Source/devtools/front_end/sources/AddSourceMapURLDialog.js

 // Copyright 2014 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}
  * @param {function(string)} callback
  */
 WebInspector.AddSourceMapURLDialog = function(callback)
 {
     WebInspector.DialogDelegate.call(this);
     this.element.classList.add("go-to-line-dialog");
     this.element.createChild("label").textContent = WebInspector.UIString("Source map URL: ");
 
     this._input = this.element.createChild("input");
     this._input.setAttribute("type", "text");
 
     this._goButton = this.element.createChild("button");
-    this._goButton.textContent = WebInspector.UIString("Go");
+    this._goButton.textContent = WebInspector.UIString("Add");
     this._goButton.addEventListener("click", this._onGoClick.bind(this), false);
 
     this._callback = callback;
 }
 
 /**
- * @param {!Element} element
  * @param {function(string)} callback
  */
-WebInspector.AddSourceMapURLDialog.show = function(element, callback)
+WebInspector.AddSourceMapURLDialog.show = function(callback)
 {
-    WebInspector.Dialog.show(element, new WebInspector.AddSourceMapURLDialog(callback));
+    WebInspector.Dialog.show(new WebInspector.AddSourceMapURLDialog(callback));
 }
 
 WebInspector.AddSourceMapURLDialog.prototype = {
     focus: function()
     {
         WebInspector.setCurrentFocusElement(this._input);
         this._input.select();
     },
 
     _onGoClick: function()
     {
         this._apply();
         WebInspector.Dialog.hide();
     },
 
     _apply: function()
     {
         var value = this._input.value;
         this._callback(value);
     },
 
     onEnter: function()
     {
         this._apply();
     },
 
     __proto__: WebInspector.DialogDelegate.prototype
 }