Login screen and Guest mode should use device owner preference

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index 32e596d56a44a7638e8fcbfb9a171ce73c525583..1efe4bfbc0ea1cae9c5f184919614092966cefc9 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -2126,6 +2126,10 @@ const char kDeviceEnrollmentCanExit[] = "enrollment.can_exit";
 // Dictionary of per-user Least Recently Used input method (used at login
 // screen).
 extern const char kUsersLRUInputMethod[] = "UsersLRUInputMethod";
+
+// Value of kUse24HourClock user preference of device' owner.
+// ChromeOS device uses this setting on login screen.
+const char kOwnerPrefUse24HourClock[] = "intl.owner_use_24hour_clock";
 #endif
 
 // Whether there is a Flash version installed that supports clearing LSO data.