Remove header dependencies from sequence_checker.h to sequenced_worker_pool.h

chrome/browser/web_applications/web_app_mac.mm

 // 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.
 
 #import "chrome/browser/web_applications/web_app_mac.h"
 
 #import <Cocoa/Cocoa.h>
 #include <stdint.h>
 
 #include <utility>
@@ skipping 11 matching lines @@
 #include "base/memory/ref_counted.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/path_service.h"
 #include "base/process/process_handle.h"
 #include "base/strings/string16.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/threading/sequenced_worker_pool.h"
 #include "base/version.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/extension_ui_util.h"
 #import "chrome/browser/mac/dock.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/shell_integration.h"
 #include "chrome/browser/ui/app_list/app_list_service.h"
 #include "chrome/common/channel_info.h"
 #include "chrome/common/chrome_constants.h"
@@ skipping 1023 matching lines @@
     std::unique_ptr<web_app::ShortcutInfo> shortcut_info =
         BuildShortcutInfoFromBundle(*it);
     WebAppShortcutCreator shortcut_creator(it->DirName(), shortcut_info.get());
     shortcut_creator.DeleteShortcuts();
   }
 }
 
 }  // namespace internals
 
 }  // namespace web_app