Add a lock to the managed user settings page and require authentication for unlocking.

chrome/common/pref_names.h

Index: chrome/common/pref_names.h
diff --git a/chrome/common/pref_names.h b/chrome/common/pref_names.h
index a1bad5237b6a13cb85e9d5dc9f81697606fdb084..2ce47f53e7c0e63f397f5a8239d242427b16cc71 100644
--- a/chrome/common/pref_names.h
+++ b/chrome/common/pref_names.h
@@ -301,6 +301,7 @@ extern const char kDeletePasswords[];
 extern const char kDeleteFormData[];
 extern const char kDeleteHostedAppsData[];
 extern const char kDeauthorizeContentLicenses[];
+extern const char kChildLockDisabled[];
 extern const char kEnableContinuousSpellcheck[];
 extern const char kSpeechRecognitionFilterProfanities[];
 extern const char kSpeechRecognitionTrayNotificationShownContexts[];
@@ -695,6 +696,9 @@ extern const char kManagedNotificationsAllowedForUrls[];
 extern const char kManagedNotificationsBlockedForUrls[];
 extern const char kManagedAutoSelectCertificateForUrls[];
 
+extern const char kManagedModeLocalPassphrase[];
+extern const char kManagedModeLocalSalt[];
+
 extern const char kAudioCaptureAllowed[];
 extern const char kVideoCaptureAllowed[];