Remove PrefServiceSimple, replacing it with PrefService and PrefRegistrySimple.

chrome/browser/background/background_mode_manager.cc

Index: chrome/browser/background/background_mode_manager.cc
diff --git a/chrome/browser/background/background_mode_manager.cc b/chrome/browser/background/background_mode_manager.cc
index 30c2e4f4aa2360b111d2ad280481a30155c23686..c805133dd771f59f794fa3b2ced03d668083508d 100644
--- a/chrome/browser/background/background_mode_manager.cc
+++ b/chrome/browser/background/background_mode_manager.cc
@@ -19,6 +19,7 @@
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_system.h"
 #include "chrome/browser/lifetime/application_lifetime.h"
+#include "chrome/browser/prefs/pref_registry_simple.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_info_cache.h"
@@ -40,9 +41,9 @@
 #include "chrome/common/pref_names.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/user_metrics.h"
+#include "grit/chrome_unscaled_resources.h"
 #include "grit/chromium_strings.h"
 #include "grit/generated_resources.h"
-#include "grit/chrome_unscaled_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
 
@@ -219,7 +220,7 @@ BackgroundModeManager::~BackgroundModeManager() {
 }
 
 // static
-void BackgroundModeManager::RegisterPrefs(PrefServiceSimple* prefs) {
+void BackgroundModeManager::RegisterPrefs(PrefRegistrySimple* prefs) {
   prefs->RegisterBooleanPref(prefs::kUserCreatedLoginItem, false);
   prefs->RegisterBooleanPref(prefs::kUserRemovedLoginItem, false);
   prefs->RegisterBooleanPref(prefs::kBackgroundModeEnabled, true);