Remove header dependencies from sequence_checker.h to sequenced_worker_pool.h

ios/chrome/browser/ui/browser_view_controller.mm

 // Copyright 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 "ios/chrome/browser/ui/browser_view_controller.h"
 
 #import <AssetsLibrary/AssetsLibrary.h>
 #import <MobileCoreServices/MobileCoreServices.h>
 #import <PassKit/PassKit.h>
 #import <Photos/Photos.h>
@@ skipping 17 matching lines @@
 #include "base/mac/foundation_util.h"
 #include "base/mac/objc_property_releaser.h"
 #import "base/mac/scoped_block.h"
 #import "base/mac/scoped_nsobject.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/metrics/user_metrics.h"
 #include "base/metrics/user_metrics_action.h"
 #include "base/strings/sys_string_conversions.h"
+#include "base/threading/sequenced_worker_pool.h"
 #include "components/bookmarks/browser/base_bookmark_model_observer.h"
 #include "components/bookmarks/browser/bookmark_model.h"
 #include "components/image_fetcher/ios/ios_image_data_fetcher_wrapper.h"
 #include "components/infobars/core/infobar_manager.h"
 #include "components/prefs/pref_service.h"
 #include "components/reading_list/core/reading_list_switches.h"
 #include "components/reading_list/ios/reading_list_model.h"
 #include "components/search_engines/search_engines_pref_names.h"
 #include "components/search_engines/template_url_service.h"
 #include "components/sessions/core/tab_restore_service_helper.h"
@@ skipping 4949 matching lines @@
 
 - (UIView*)voiceSearchButton {
   return _voiceSearchButton;
 }
 
 - (id<LogoAnimationControllerOwner>)logoAnimationControllerOwner {
   return [self currentLogoAnimationControllerOwner];
 }
 
 @end