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

chrome/browser/ui/views/elevation_icon_setter.cc

 // Copyright 2014 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/ui/views/elevation_icon_setter.h"
 
 #include "base/callback.h"
 #include "base/task_runner_util.h"
+#include "base/threading/sequenced_worker_pool.h"
 #include "build/build_config.h"
 #include "content/public/browser/browser_thread.h"
 #include "ui/views/controls/button/label_button.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #include <shellapi.h>
 #include "base/win/win_util.h"
 #include "base/win/windows_version.h"
 #include "ui/display/win/dpi.h"
@@ skipping 67 matching lines @@
     button_->SetImage(
         views::Button::STATE_NORMAL,
         gfx::ImageSkia(gfx::ImageSkiaRep(*icon, device_scale_factor)));
     button_->SizeToPreferredSize();
     if (button_->parent())
       button_->parent()->Layout();
     if (!callback.is_null())
       callback.Run();
   }
 }