Switch from SignedSettings to DeviceSettingsService.

chrome/browser/chromeos/settings/system_settings_provider.cc

Index: chrome/browser/chromeos/settings/system_settings_provider.cc
diff --git a/chrome/browser/chromeos/settings/system_settings_provider.cc b/chrome/browser/chromeos/settings/system_settings_provider.cc
index 5148c74127965149c3add8966a4c4b1af32bc06e..75a865629b62c904920ac16f05a167e863d8bb60 100644
--- a/chrome/browser/chromeos/settings/system_settings_provider.cc
+++ b/chrome/browser/chromeos/settings/system_settings_provider.cc
@@ -60,11 +60,6 @@ bool SystemSettingsProvider::HandlesSetting(const std::string& path) const {
   return path == kSystemTimezone;
 }
 
-void SystemSettingsProvider::Reload() {
-  // TODO(pastarmovj): We can actually cache the timezone here to make returning
-  // it faster.
-}
-
 void SystemSettingsProvider::TimezoneChanged(const icu::TimeZone& timezone) {
   // Fires system setting change notification.
   timezone_value_.reset(base::Value::CreateStringValue(