Cleanup: Remove unneeded chrome/browser/prefs/pref_service.h usage....

chrome/browser/background_mode_manager.cc

 // Copyright (c) 2010 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 <string>
+
 #include "app/l10n_util.h"
 #include "app/resource_bundle.h"
 #include "base/base_paths.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/background_application_list_model.h"
 #include "chrome/browser/background_mode_manager.h"
 #include "chrome/browser/browser_list.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/metrics/user_metrics.h"
-#include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/status_icons/status_icon.h"
 #include "chrome/browser/status_icons/status_tray.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/notification_service.h"
 #include "chrome/common/notification_type.h"
 #include "chrome/common/pref_names.h"
 #include "grit/chromium_strings.h"
 #include "grit/generated_resources.h"
@@ skipping 341 matching lines @@
   // is always running on that platform, making it superfluous.
 #if defined(OS_CHROMEOS)
   return false;
 #else
   bool background_mode_enabled =
       !command_line->HasSwitch(switches::kDisableBackgroundMode) &&
       !command_line->HasSwitch(switches::kDisableExtensions);
   return background_mode_enabled;
 #endif
 }