Various IWYU fixes.

chrome/browser/upgrade_detector_impl.cc

 // 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.
 
 #include "chrome/browser/upgrade_detector_impl.h"
 
 #include <stdint.h>
 
 #include <memory>
 #include <string>
@@ skipping 16 matching lines @@
 #include "chrome/common/pref_names.h"
 #include "components/network_time/network_time_tracker.h"
 #include "components/prefs/pref_service.h"
 #include "components/version_info/version_info.h"
 #include "content/public/browser/browser_thread.h"
 
 #if defined(OS_WIN)
 #include "base/win/win_util.h"
 #include "chrome/installer/util/browser_distribution.h"
 #include "chrome/installer/util/google_update_settings.h"
-#include "chrome/installer/util/helper.h"
 #include "chrome/installer/util/install_util.h"
 #elif defined(OS_MACOSX)
 #include "chrome/browser/mac/keystone_glue.h"
 #endif
 
 using content::BrowserThread;
 
 namespace {
 
 // How long (in milliseconds) to wait (each cycle) before checking whether
@@ skipping 458 matching lines @@
 
 // static
 UpgradeDetectorImpl* UpgradeDetectorImpl::GetInstance() {
   return base::Singleton<UpgradeDetectorImpl>::get();
 }
 
 // static
 UpgradeDetector* UpgradeDetector::GetInstance() {
   return UpgradeDetectorImpl::GetInstance();
 }