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

chrome/browser/ui/views/tab_contents/native_tab_contents_container_gtk.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/tab_contents/native_tab_contents_container_gtk.h"
 
 #include "chrome/browser/ui/view_ids.h"
 #include "chrome/browser/ui/views/tab_contents/native_tab_contents_container_views.h"
 #include "chrome/browser/ui/views/tab_contents/tab_contents_container.h"
 #include "chrome/browser/ui/views/tab_contents/tab_contents_view_views.h"
 #include "content/browser/renderer_host/render_widget_host_view.h"
 #include "content/browser/tab_contents/interstitial_page.h"
 #include "content/browser/tab_contents/tab_contents.h"
 #include "ui/base/accessibility/accessible_view_state.h"
 #include "views/focus/focus_manager.h"
+#include "views/views_delegate.h"
 
 ////////////////////////////////////////////////////////////////////////////////
 // NativeTabContentsContainerGtk, public:
 
 NativeTabContentsContainerGtk::NativeTabContentsContainerGtk(
     TabContentsContainer* container)
     : container_(container),
       focus_callback_id_(0) {
   set_id(VIEW_ID_TAB_CONTAINER_FOCUS_VIEW);
 }
@@ skipping 113 matching lines @@
     ui::AccessibleViewState* state) {
   state->role = ui::AccessibilityTypes::ROLE_GROUPING;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // NativeTabContentsContainer, public:
 
 // static
 NativeTabContentsContainer* NativeTabContentsContainer::CreateNativeContainer(
     TabContentsContainer* container) {
-  if (views::Widget::IsPureViews())
+  if (views::Widget::IsPureViews() &&
+      views::ViewsDelegate::views_delegate->GetDefaultParentView())
     return new NativeTabContentsContainerViews(container);
   return new NativeTabContentsContainerGtk(container);
 }