Remove PrefServiceSimple, replacing it with PrefService and PrefRegistrySimple.

chrome/browser/chromeos/settings/device_settings_cache.cc

Index: chrome/browser/chromeos/settings/device_settings_cache.cc
diff --git a/chrome/browser/chromeos/settings/device_settings_cache.cc b/chrome/browser/chromeos/settings/device_settings_cache.cc
index d8c57399bf12ae879b0993ad548cbf8a4c2e9868..7383999b7e43f56580ce71934ae0054f7ae0ac00 100644
--- a/chrome/browser/chromeos/settings/device_settings_cache.cc
+++ b/chrome/browser/chromeos/settings/device_settings_cache.cc
@@ -10,6 +10,7 @@
 #include "base/bind.h"
 #include "chrome/browser/chromeos/settings/cros_settings.h"
 #include "chrome/browser/policy/proto/device_management_backend.pb.h"
+#include "chrome/browser/prefs/pref_registry_simple.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/common/pref_names.h"
 
@@ -19,7 +20,7 @@ namespace chromeos {
 
 namespace device_settings_cache {
 
-void RegisterPrefs(PrefServiceSimple* local_state) {
+void RegisterPrefs(PrefRegistrySimple* local_state) {
   local_state->RegisterStringPref(prefs::kDeviceSettingsCache, "invalid");
 }