Require a default parent to use some Views implementations on Windows.

chrome/browser/ui/views/frame/browser_frame_win.cc

 // Copyright (c) 2011 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.
 
 #include "chrome/browser/ui/views/frame/browser_frame_win.h"
 
 #include <dwmapi.h>
 #include <shellapi.h>
 
 #include <set>
 
 #include "chrome/browser/ui/browser_list.h"
 #include "chrome/browser/ui/views/frame/browser_frame_views.h"
 #include "chrome/browser/ui/views/frame/browser_view.h"
 #include "content/browser/accessibility/browser_accessibility_state.h"
 #include "grit/theme_resources.h"
 #include "ui/base/theme_provider.h"
 #include "ui/gfx/font.h"
 #include "views/screen.h"
+#include "views/views_delegate.h"
 #include "views/widget/native_widget_win.h"
 #include "views/widget/widget.h"
 #include "views/window/non_client_view.h"
 
 // static
 static const int kClientEdgeThickness = 3;
 static const int kTabDragWindowAlpha = 200;
 // We need to offset the DWMFrame into the toolbar so that the blackness
 // doesn't show up on our rounded corners.
 static const int kDWMFrameTopOffset = 3;
@@ skipping 180 matching lines @@
   return *title_font;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // NativeBrowserFrame, public:
 
 // static
 NativeBrowserFrame* NativeBrowserFrame::CreateNativeBrowserFrame(
     BrowserFrame* browser_frame,
     BrowserView* browser_view) {
-  if (views::Widget::IsPureViews())
+  if (views::Widget::IsPureViews() &&
+      views::ViewsDelegate::views_delegate->GetDefaultParentView())
     return new BrowserFrameViews(browser_frame, browser_view);
   return new BrowserFrameWin(browser_frame, browser_view);
 }