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

ui/shell/minimal_shell.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 "ui/shell/minimal_shell.h"
 
 #include "ui/aura/client/default_activation_client.h"
 #include "ui/aura/client/default_capture_client.h"
 #include "ui/aura/env.h"
 #include "ui/aura/root_window.h"
@@ skipping 12 matching lines @@
   aura::client::SetWindowTreeClient(root_window_->window(), this);
 
   focus_client_.reset(new aura::test::TestFocusClient);
   aura::client::SetFocusClient(root_window_->window(), focus_client_.get());
 
   root_window_event_filter_ = new views::corewm::CompoundEventFilter;
   // Pass ownership of the filter to the root_window.
   root_window_->window()->SetEventFilter(root_window_event_filter_);
 
   input_method_filter_.reset(new views::corewm::InputMethodEventFilter(
-      root_window_->GetAcceleratedWidget()));
+      root_window_->host()->GetAcceleratedWidget()));
   input_method_filter_->SetInputMethodPropertyInRootWindow(
       root_window_->window());
   root_window_event_filter_->AddHandler(input_method_filter_.get());
 
   activation_client_.reset(
       new aura::client::DefaultActivationClient(root_window_->window()));
 
   capture_client_.reset(
       new aura::client::DefaultCaptureClient(root_window_->window()));
 }
 
 MinimalShell::~MinimalShell() {
   root_window_event_filter_->RemoveHandler(input_method_filter_.get());
 }
 
 aura::Window* MinimalShell::GetDefaultParent(
     aura::Window* context,
     aura::Window* window,
     const gfx::Rect& bounds) {
   return root_window_->window();
 }
 
 }  // namespace shell