[DevTools] Move Popover to shadow DOM.

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

 /*
  * Copyright (C) 2011 Google Inc.  All rights reserved.
  * Copyright (C) 2006, 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2007 Matt Lilek (pewtermoose@gmail.com).
  * Copyright (C) 2009 Joseph Pecoraro
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
@@ skipping 1172 matching lines @@
   document.defaultView.addEventListener('focus', UI._windowFocused.bind(UI, document), false);
   document.defaultView.addEventListener('blur', UI._windowBlurred.bind(UI, document), false);
   document.addEventListener('focus', UI._focusChanged.bind(UI), true);
 
   if (!UI.themeSupport)
     UI.themeSupport = new UI.ThemeSupport(themeSetting);
   UI.themeSupport.applyTheme(document);
 
   var body = /** @type {!Element} */ (document.body);
   UI.appendStyle(body, 'ui/inspectorStyle.css');
-  UI.appendStyle(body, 'ui/popover.css');
   UI.GlassPane.setContainer(/** @type {!Element} */ (document.body));
 };
 
 /**
  * @param {string} name
  * @return {string}
  */
 UI.beautifyFunctionName = function(name) {
   return name || Common.UIString('(anonymous)');
 };
@@ skipping 861 matching lines @@
    */
   constructor(message, okCallback, cancelCallback) {
     super(true);
     this.registerRequiredCSS('ui/confirmDialog.css');
     this.contentElement.createChild('div', 'message').createChild('span').textContent = message;
     var buttonsBar = this.contentElement.createChild('div', 'button');
     buttonsBar.appendChild(UI.createTextButton(Common.UIString('Ok'), okCallback));
     buttonsBar.appendChild(UI.createTextButton(Common.UIString('Cancel'), cancelCallback));
   }
 };