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

ash/display/virtual_keyboard_window_controller.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 "ash/display/virtual_keyboard_window_controller.h"
 
 #include "ash/display/display_controller.h"
 #include "ash/display/display_info.h"
 #include "ash/display/display_manager.h"
 #include "ash/host/root_window_host_factory.h"
@@ skipping 34 matching lines @@
     // No need to remove RootWindowObserver because
     // the DisplayController object outlives RootWindow objects.
     root_window->AddRootWindowObserver(
         Shell::GetInstance()->display_controller());
     InitRootWindowSettings(root_window->window())->display_id =
         display_info.id();
     root_window->Init();
     RootWindowController::CreateForVirtualKeyboardDisplay(root_window);
     root_window_controller_.reset(GetRootWindowController(
         root_window->window()));
-    root_window_controller_->dispatcher()->ShowRootWindow();
+    root_window_controller_->dispatcher()->host()->Show();
   } else {
     aura::RootWindow* root_window = root_window_controller_->dispatcher();
     GetRootWindowSettings(root_window->window())->display_id =
         display_info.id();
     root_window->SetHostBounds(display_info.bounds_in_native());
   }
 }
 
 void VirtualKeyboardWindowController::Close() {
   if (root_window_controller_.get()) {
     root_window_controller_->dispatcher()->RemoveRootWindowObserver(
         Shell::GetInstance()->display_controller());
     root_window_controller_->Shutdown();
     root_window_controller_.reset();
   }
 }
 
 }  // namespace internal
 }  // namespace ash