Login screen and Guest mode should use device owner preference

chrome/common/pref_names.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Constants for the names of various preferences, for easier changing.
 
 #ifndef CHROME_COMMON_PREF_NAMES_H_
 #define CHROME_COMMON_PREF_NAMES_H_
 
 #include <stddef.h>
@@ skipping 756 matching lines @@
 extern const char kAudioOutputAllowed[];
 extern const char kOwnerPrimaryMouseButtonRight[];
 extern const char kOwnerTapToClickEnabled[];
 extern const char kUptimeLimit[];
 extern const char kRebootAfterUpdate[];
 extern const char kDeviceRobotAnyApiRefreshToken[];
 extern const char kDeviceEnrollmentRequisition[];
 extern const char kDeviceEnrollmentAutoStart[];
 extern const char kDeviceEnrollmentCanExit[];
 extern const char kUsersLRUInputMethod[];
+extern const char kOwnerPrefUse24HourClock[];
 #endif
 
 extern const char kClearPluginLSODataEnabled[];
 extern const char kPepperFlashSettingsEnabled[];
 extern const char kDiskCacheDir[];
 extern const char kDiskCacheSize[];
 extern const char kMediaCacheSize[];
 
 extern const char kChromeOsReleaseChannel[];
 
@@ skipping 128 matching lines @@
 extern const char kAppListAppLaunchCount[];
 
 extern const char kModuleConflictBubbleShown[];
 
 extern const char kDRMSalt[];
 extern const char kEnableDRM[];
 
 }  // namespace prefs
 
 #endif  // CHROME_COMMON_PREF_NAMES_H_