Factor out uses of the WebContentsModalDialog interface from platform-independent code

chrome/browser/ui/views/constrained_window_views_browsertest.cc

 // Copyright (c) 2012 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 "base/memory/weak_ptr.h"
+#include "chrome/browser/platform_util.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_commands.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/browser/ui/views/constrained_window_views.h"
 #include "chrome/browser/ui/views/frame/browser_view.h"
 #include "chrome/browser/ui/web_contents_modal_dialog_manager.h"
 #include "chrome/browser/ui/webui/constrained_web_dialog_ui.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/test/base/in_process_browser_test.h"
@@ skipping 313 matching lines @@
 
   GURL new_tab_url(chrome::kChromeUINewTabURL);
   ui_test_utils::NavigateToURL(browser(), new_tab_url);
   ConstrainedWebDialogDelegate* cwdd = CreateConstrainedWebDialog(
       browser()->profile(),
       new ui::test::TestWebDialogDelegate(new_tab_url),
       NULL,
       web_contents);
 
   ConstrainedWindowViews* cwv =
-      static_cast<ConstrainedWindowViews*>(cwdd->GetWindow());
+      static_cast<ConstrainedWindowViews*>(
+          views::Widget::GetWidgetForNativeView(cwdd->GetNativeDialog()));
   views::test::TestWidgetObserver observer(cwv);
   cwv->FocusWebContentsModalDialog();
 
   content::RenderViewHost* render_view_host =
       cwdd->GetWebContents()->GetRenderViewHost();
   ForwardKeyEvent(render_view_host, ui::VKEY_ESCAPE);
 
   // Escape is not processed as accelerator before it's sent to web contents.
   EXPECT_FALSE(observer.widget_closed());
 
   content::RunAllPendingInMessageLoop();
 
   // Escape is processed as accelerator after it's sent to web contents.
   EXPECT_TRUE(observer.widget_closed());
 }
 
 #endif  // defined(OS_WIN) || (defined(USE_AURA) && defined(USE_X11))