Make GetRootWindow() return a Window instead of a RootWindow.

chrome/browser/ui/views/certificate_viewer_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/certificate_viewer.h"
 
 #include <windows.h>
 #include <cryptuiapi.h>
 #pragma comment(lib, "cryptui.lib")
 
@@ skipping 38 matching lines @@
 
 }  // namespace
 
 #if defined(USE_AURA)
 void ShowCertificateViewer(content::WebContents* web_contents,
                            gfx::NativeWindow parent,
                            net::X509Certificate* cert) {
   if (chrome::GetHostDesktopTypeForNativeWindow(parent) !=
       chrome::HOST_DESKTOP_TYPE_ASH) {
     ShowCertificateViewerImpl(
-        web_contents, parent->GetRootWindow()->GetAcceleratedWidget(), cert);
+        web_contents, parent->GetDispatcher()->GetAcceleratedWidget(), cert);
   } else {
     NOTIMPLEMENTED();
   }
 }
 #else
 void ShowCertificateViewer(content::WebContents* web_contents,
                            gfx::NativeWindow parent,
                            net::X509Certificate* cert) {
   ShowCertificateViewerImpl(web_contents, parent, cert);
 }
 #endif