DevTools: fix styles for glasspane

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 29 matching lines @@
 
     this._glassPane = new WebInspector.GlassPane();
     WebInspector.GlassPane.DefaultFocusedViewStack.push(this);
 
     // Install glass pane capturing events.
     this._glassPane.element.tabIndex = 0;
     this._glassPane.element.addEventListener("focus", this._onGlassPaneFocus.bind(this), false);
 
     this._element = this._glassPane.element.createChild("div");
     this._element.tabIndex = 0;
+    this._element.classList.add("component-root");
     this._element.addEventListener("focus", this._onFocus.bind(this), false);
     this._element.addEventListener("keydown", this._onKeyDown.bind(this), false);
     this._closeKeys = [
         WebInspector.KeyboardShortcut.Keys.Enter.code,
         WebInspector.KeyboardShortcut.Keys.Esc.code,
     ];
 
     delegate.show(this._element);
 
     this._position();
@@ skipping 146 matching lines @@
 {
     return WebInspector.Dialog._modalHostView;
 };
 
 WebInspector.Dialog.modalHostRepositioned = function()
 {
     if (WebInspector.Dialog._instance)
         WebInspector.Dialog._instance._position();
 };