Added policy for disabling locally managed users.

chrome/browser/chromeos/policy/device_policy_decoder_chromeos.cc

Index: chrome/browser/chromeos/policy/device_policy_decoder_chromeos.cc
diff --git a/chrome/browser/chromeos/policy/device_policy_decoder_chromeos.cc b/chrome/browser/chromeos/policy/device_policy_decoder_chromeos.cc
index b1d9b62dfea67ab52a9543400d71f9e523db313d..1f4318ea79c8cac3ecb70e0375d7b9ab11bdd936 100644
--- a/chrome/browser/chromeos/policy/device_policy_decoder_chromeos.cc
+++ b/chrome/browser/chromeos/policy/device_policy_decoder_chromeos.cc
@@ -177,6 +177,19 @@ void DecodeLoginPolicies(const em::ChromeDeviceSettingsProto& policy,
                         container.enable_auto_login_bailout()));
     }
   }
+
+  if (policy.has_locally_managed_users_settings()) {
+    const em::LocallyManagedUsersSettingsProto& container =
+      policy.locally_managed_users_settings();
+    if (container.has_locally_managed_users_enabled()) {
+      Value* value = Value::CreateBooleanValue(
+          container.locally_managed_users_enabled());
+      policies->Set(key::kSupervisedUsersEnabled,
+                    POLICY_LEVEL_MANDATORY,
+                    POLICY_SCOPE_MACHINE,
+                    value);
+    }
+  }
 }
 
 void DecodeKioskPolicies(const em::ChromeDeviceSettingsProto& policy,