Add Sync data type for managed users.

sync/protocol/proto_value_conversions.h

Index: sync/protocol/proto_value_conversions.h
diff --git a/sync/protocol/proto_value_conversions.h b/sync/protocol/proto_value_conversions.h
index 5a98758e020f84516ff983bd372eb37f1b62aded..8bcc26d1363b9b6c2bc8f2ad85f0c9264d5988a5 100644
--- a/sync/protocol/proto_value_conversions.h
+++ b/sync/protocol/proto_value_conversions.h
@@ -42,6 +42,7 @@ class GlobalIdDirective;
 class HistoryDeleteDirectiveSpecifics;
 class KeystoreEncryptionFlagsSpecifics;
 class ManagedUserSettingSpecifics;
+class ManagedUserSpecifics;
 class NigoriSpecifics;
 class PasswordSpecifics;
 class PasswordSpecificsData;
@@ -170,6 +171,9 @@ SYNC_EXPORT base::DictionaryValue* HistoryDeleteDirectiveSpecificsToValue(
 SYNC_EXPORT_PRIVATE base::DictionaryValue* ManagedUserSettingSpecificsToValue(
     const sync_pb::ManagedUserSettingSpecifics& managed_user_setting_specifics);
 
+SYNC_EXPORT_PRIVATE base::DictionaryValue* ManagedUserSpecificsToValue(
+    const sync_pb::ManagedUserSpecifics& managed_user_specifics);
+
 SYNC_EXPORT_PRIVATE base::DictionaryValue* NigoriSpecificsToValue(
     const sync_pb::NigoriSpecifics& nigori_specifics);