Remove window/host accessors from WED; IWYU for WTH

ui/views/widget/desktop_aura/desktop_capture_client.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/views/widget/desktop_aura/desktop_capture_client.h"
 
 #include "ui/aura/window.h"
 #include "ui/aura/window_event_dispatcher.h"
+#include "ui/aura/window_tree_host.h"
 
 namespace views {
 
 // static
 DesktopCaptureClient::CaptureClients*
 DesktopCaptureClient::capture_clients_ = NULL;
 
 DesktopCaptureClient::DesktopCaptureClient(aura::Window* root)
     : root_(root),
       capture_window_(NULL) {
@@ skipping 69 matching lines @@
 aura::Window* DesktopCaptureClient::GetGlobalCaptureWindow() {
   for (CaptureClients::iterator i = capture_clients_->begin();
        i != capture_clients_->end(); ++i) {
     if ((*i)->capture_window_)
       return (*i)->capture_window_;
   }
   return NULL;
 }
 
 }  // namespace views