Remove window/host accessors from WED; IWYU for WTH

ui/aura/client/default_capture_client.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 "ui/aura/client/default_capture_client.h"
 
 #include "ui/aura/window.h"
 #include "ui/aura/window_event_dispatcher.h"
+#include "ui/aura/window_tree_host.h"
 
 namespace aura {
 namespace client {
 
 DefaultCaptureClient::DefaultCaptureClient(Window* root_window)
     : root_window_(root_window),
       capture_window_(NULL) {
   SetCaptureClient(root_window_, this);
 }
 
@@ skipping 30 matching lines @@
 Window* DefaultCaptureClient::GetCaptureWindow() {
   return capture_window_;
 }
 
 Window* DefaultCaptureClient::GetGlobalCaptureWindow() {
   return capture_window_;
 }
 
 }  // namespace client
 }  // namespace aura