Fix linux_chromeos_clang compile for app_shell

apps/shell/app_shell_browser_main_parts.cc

 // Copyright 2013 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 "apps/shell/app_shell_browser_main_parts.h"
 
 #include "apps/shell/web_view_window.h"
 #include "base/run_loop.h"
 #include "content/public/common/result_codes.h"
 #include "content/shell/browser/shell_browser_context.h"
@@ skipping 32 matching lines @@
       gfx::SCREEN_TYPE_NATIVE, aura::TestScreen::Create());
   // Set up basic pieces of views::corewm.
   minimal_shell_.reset(new shell::MinimalShell(gfx::Size(800, 600)));
   // Ensure the X window gets mapped.
   minimal_shell_->root_window()->ShowRootWindow();
 
   // TODO(jamescook): Create an apps::ShellWindow here. For now, create a
   // window with a WebView just to ensure that the content module is properly
   // initialized.
   ShowWebViewWindow(browser_context_.get(),
-                    minimal_shell_->root_window());
+                    minimal_shell_->root_window()->window());
 }
 
 bool AppShellBrowserMainParts::MainMessageLoopRun(int* result_code)  {
   base::RunLoop run_loop;
   run_loop.Run();
   *result_code = content::RESULT_CODE_NORMAL_EXIT;
   return true;
 }
 
 void AppShellBrowserMainParts::PostMainMessageLoopRun() {
   browser_context_.reset();
   minimal_shell_.reset();
   aura::Env::DeleteInstance();
 }
 
 }  // namespace apps