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

ui/aura/bench/bench_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/bind.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"
@@ skipping 345 matching lines @@
   } else {
     bench.reset(new WebGLBench(&page_background,
                                root_window->compositor(),
                                frames));
   }
 
 #ifndef NDEBUG
   ui::PrintLayerHierarchy(root_window->window()->layer(), gfx::Point(100, 100));
 #endif
 
-  root_window->ShowRootWindow();
+  root_window->host()->Show();
   base::MessageLoopForUI::current()->Run();
   focus_client.reset();
   root_window.reset();
 
   return 0;
 }