Timezone auto update option should be available by default.

chrome/browser/about_flags.cc

Index: chrome/browser/about_flags.cc
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index fe9a62323e0c3d1a085a53c33b935d7a0561ed04..e99cfad94df43c9d6b2a75352f77ccdeb2634424 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -2154,11 +2154,11 @@ const Experiment kExperiments[] = {
   },
 #if defined(OS_CHROMEOS)
   {
-    "enable-timezone-tracking",
-    IDS_FLAGS_ENABLE_RESOLVE_TIMEZONE_BY_GEOLOCATION_NAME,
-    IDS_FLAGS_ENABLE_RESOLVE_TIMEZONE_BY_GEOLOCATION_DESCRIPTION,
+    "disable-timezone-tracking",
+    IDS_FLAGS_DISABLE_RESOLVE_TIMEZONE_BY_GEOLOCATION_NAME,
+    IDS_FLAGS_DISABLE_RESOLVE_TIMEZONE_BY_GEOLOCATION_DESCRIPTION,
     kOsCrOS,
-    SINGLE_VALUE_TYPE(chromeos::switches::kEnableTimeZoneTrackingOption)
+    SINGLE_VALUE_TYPE(chromeos::switches::kDisableTimeZoneTrackingOption)
   },
 #endif  // defined(OS_CHROMEOS)