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 ee40e2bab15214b08231a61aec782af11abed3a7..165e337fbae93cacfb04337f12c4d9c56b71d454 100644
--- a/sync/protocol/proto_value_conversions.h
+++ b/sync/protocol/proto_value_conversions.h
@@ -46,6 +46,7 @@ class HistoryDeleteDirectiveSpecifics;
 class KeystoreEncryptionFlagsSpecifics;
 class Media;
 class ManagedUserSettingSpecifics;
+class ManagedUserSharedSettingSpecifics;
 class ManagedUserSpecifics;
 class NigoriSpecifics;
 class PasswordSpecifics;
@@ -225,6 +226,11 @@ 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);