Remove some pass-thrus on RootWindow API in favor of exposing the RootWindowHost again.

ui/aura/demo/demo_main.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/at_exit.h"
 #include "base/command_line.h"
 #include "base/i18n/icu_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "third_party/skia/include/core/SkXfermode.h"
@@ skipping 133 matching lines @@
       &window2, root_window->window(), gfx::Rect());
 
   DemoWindowDelegate window_delegate3(SK_ColorGREEN);
   aura::Window window3(&window_delegate3);
   window3.set_id(3);
   window3.Init(ui::LAYER_TEXTURED);
   window3.SetBounds(gfx::Rect(10, 10, 50, 50));
   window3.Show();
   window2.AddChild(&window3);
 
-  root_window->ShowRootWindow();
+  root_window->host()->Show();
   base::MessageLoopForUI::current()->Run();
 
   return 0;
 }
 
 }  // namespace
 
 int main(int argc, char** argv) {
   CommandLine::Init(argc, argv);
 
   // The exit manager is in charge of calling the dtors of singleton objects.
   base::AtExitManager exit_manager;
 
   ui::RegisterPathProvider();
   base::i18n::InitializeICU();
   ResourceBundle::InitSharedInstanceWithLocale("en-US", NULL);
 
   return DemoMain();
 }