Add Sync datatype for shared managed user settings.

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 9bf45e3267efedfb47bfeaf41b603fb6b079e02f..93570315fd45feaf2cc76bdb040106bcee97bff2 100644
--- a/sync/protocol/proto_value_conversions.h
+++ b/sync/protocol/proto_value_conversions.h
@@ -47,6 +47,7 @@ class HistoryDeleteDirectiveSpecifics;
 class KeystoreEncryptionFlagsSpecifics;
 class Media;
 class ManagedUserSettingSpecifics;
+class ManagedUserSharedSettingSpecifics;
 class ManagedUserSpecifics;
 class NigoriSpecifics;
 class PasswordSpecifics;
@@ -230,6 +231,11 @@ SYNC_EXPORT_PRIVATE base::DictionaryValue* ManagedUserSettingSpecificsToValue(
 SYNC_EXPORT_PRIVATE base::DictionaryValue* ManagedUserSpecificsToValue(
     const sync_pb::ManagedUserSpecifics& managed_user_specifics);
 
+SYNC_EXPORT_PRIVATE base::DictionaryValue*
+    ManagedUserSharedSettingSpecificsToValue(
+        const sync_pb::ManagedUserSharedSettingSpecifics&
+            managed_user_shared_setting_specifics);
+
 SYNC_EXPORT_PRIVATE base::DictionaryValue* MediaToValue(
     const sync_pb::Media& media);