Timezone auto update option should be available by default.

chrome/browser/ui/webui/options/browser_options_handler.cc

Index: chrome/browser/ui/webui/options/browser_options_handler.cc
diff --git a/chrome/browser/ui/webui/options/browser_options_handler.cc b/chrome/browser/ui/webui/options/browser_options_handler.cc
index 72b1c38a0d112c11e146178148ca5053acc781d3..d00be98ca9112547d7bfecc81ee1d8a1ecd39141 100644
--- a/chrome/browser/ui/webui/options/browser_options_handler.cc
+++ b/chrome/browser/ui/webui/options/browser_options_handler.cc
@@ -681,11 +681,11 @@ void BrowserOptionsHandler::GetLocalizedValues(base::DictionaryValue* values) {
       "showWakeOnWifi",
       chromeos::WakeOnWifiManager::Get()->WakeOnWifiSupported() &&
       chromeos::switches::WakeOnWifiEnabled());
-  const bool have_enable_time_zone_tracking_option_switch =
+  const bool have_disable_time_zone_tracking_option_switch =
       base::CommandLine::ForCurrentProcess()->HasSwitch(
-          chromeos::switches::kEnableTimeZoneTrackingOption);
+          chromeos::switches::kDisableTimeZoneTrackingOption);
   values->SetBoolean("enableTimeZoneTrackingOption",
-                     have_enable_time_zone_tracking_option_switch &&
+                     !have_disable_time_zone_tracking_option_switch &&
                          !chromeos::system::HasSystemTimezonePolicy());
 #endif
 }