Switch from SignedSettings to DeviceSettingsService.

chrome/browser/chromeos/system_settings_provider.cc

Index: chrome/browser/chromeos/system_settings_provider.cc
diff --git a/chrome/browser/chromeos/system_settings_provider.cc b/chrome/browser/chromeos/system_settings_provider.cc
index aec6d20037cfc218331ab622806e153a017170b1..738eeb64b37328db3bd4ca0a81d1d04778e49531 100644
--- a/chrome/browser/chromeos/system_settings_provider.cc
+++ b/chrome/browser/chromeos/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(