Disable supervised user creation when force sign in is enabled.

chrome/browser/supervised_user/supervised_user_creation_policy_handler.h

Index: chrome/browser/supervised_user/supervised_user_creation_policy_handler.h
diff --git a/chrome/browser/supervised_user/supervised_user_creation_policy_handler.h b/chrome/browser/supervised_user/supervised_user_creation_policy_handler.h
new file mode 100644
index 0000000000000000000000000000000000000000..daa803831b035c524ebfff1159b07e4165e3d607
--- /dev/null
+++ b/chrome/browser/supervised_user/supervised_user_creation_policy_handler.h
@@ -0,0 +1,31 @@
+// Copyright 2016 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.
+
+#ifndef CHROME_BROWSER_SUPERVISED_USER_SUPERVISED_USER_CREATION_POLICY_HANDLER_H_
+#define CHROME_BROWSER_SUPERVISED_USER_SUPERVISED_USER_CREATION_POLICY_HANDLER_H_
+
+#include "base/macros.h"
+#include "components/policy/core/browser/configuration_policy_handler.h"
+
+class PrefValueMap;
+
+namespace policy {
+
+class PolicyMap;
+
+class SupervisedUserCreationPolicyHandler : public TypeCheckingPolicyHandler {
+ public:
+  SupervisedUserCreationPolicyHandler();
+  ~SupervisedUserCreationPolicyHandler() override;
+
+  void ApplyPolicySettings(const PolicyMap& policies,
+                           PrefValueMap* prefs) override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(SupervisedUserCreationPolicyHandler);
+};
+
+}  // namespace policy
+
+#endif  // CHROME_BROWSER_SUPERVISED_USER_SUPERVISED_USER_CREATION_POLICY_HANDLER_H_