Add missing #include around sequenced_worker_pool.h in //chrome

chrome/browser/media/webrtc/desktop_media_list_ash.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 "chrome/browser/media/webrtc/desktop_media_list_ash.h"
 
 #include "ash/public/cpp/shell_window_ids.h"
 #include "ash/shell.h"
+#include "base/threading/sequenced_worker_pool.h"
 #include "chrome/grit/generated_resources.h"
 #include "content/public/browser/browser_thread.h"
 #include "media/base/video_util.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/gfx/image/image.h"
 #include "ui/snapshot/snapshot.h"
 
 using content::BrowserThread;
 
 namespace {
@@ skipping 114 matching lines @@
 
   --pending_window_capture_requests_;
   DCHECK_GE(pending_window_capture_requests_, 0);
 
   if (!pending_window_capture_requests_) {
     // Once we've finished capturing all windows post a task for the next list
     // update.
     ScheduleNextRefresh();
   }
 }