[DevTools] Do not use Dialog.detach as it doesn't exist.

third_party/WebKit/Source/devtools/front_end/ui/Dialog.js

 /*
  * Copyright (C) 2012 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 43 matching lines @@
   }
 
   /**
    * @override
    * @param {!Document|!Element=} where
    */
   show(where) {
     var document = /** @type {!Document} */ (
         where instanceof Document ? where : (where || UI.inspectorView.element).ownerDocument);
     if (UI.Dialog._instance)
-      UI.Dialog._instance.detach();
+      UI.Dialog._instance.hide();
     UI.Dialog._instance = this;
     this._disableTabIndexOnElements(document);
     super.show(document);
     this._focusRestorer = new UI.WidgetFocusRestorer(this.widget());
   }
 
   /**
    * @override
    */
   hide() {
@@ skipping 35 matching lines @@
   /**
    * @param {!Event} event
    */
   _onKeyDown(event) {
     if (event.keyCode === UI.KeyboardShortcut.Keys.Esc.code) {
       event.consume(true);
       this.hide();
     }
   }
 };