DevTools: follow-up to view introduction, fix styles css.

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

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * Copyright (C) 2011 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 76 matching lines @@
     isShowing: function()
     {
         return this._isShowing;
     },
 
     /**
      * @return {boolean}
      */
     shouldHideOnDetach: function()
     {
+        if (!this.element.parentElement)
+            return false;
         if (this._hideOnDetach)
             return true;
         for (var child of this._children) {
             if (child.shouldHideOnDetach())
                 return true;
         }
         return false;
     },
 
     setHideOnDetach: function()
@@ skipping 580 matching lines @@
 
 /**
  * @constructor
  * @extends {WebInspector.VBox}
  * @param {string} title
  * @param {boolean=} isWebComponent
  */
 WebInspector.View = function(title, isWebComponent)
 {
     WebInspector.VBox.call(this, isWebComponent);
+    this.element.classList.add("view");
     this._title = title;
     /** @type {!Array<!WebInspector.ToolbarItem>} */
     this._toolbarItems = [];
 }
 
 WebInspector.View.prototype = {
     /**
      * @return {string}
      */
     title: function()
@@ skipping 98 matching lines @@
 {
     WebInspector.Widget.__assert(!child.__widgetCounter && !child.__widget, "Attempt to remove element containing widget via regular DOM operation");
     return WebInspector.Widget._originalRemoveChild.call(this, child);
 }
 
 Element.prototype.removeChildren = function()
 {
     WebInspector.Widget.__assert(!this.__widgetCounter, "Attempt to remove element containing widget via regular DOM operation");
     WebInspector.Widget._originalRemoveChildren.call(this);
 }