Create a fresh sync datatype for Synced Notifications

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 4dded179933fefcd4f995306300590c0e2c4585d..0b54b07de251c17781a7563c97fdb439b52d6f0a 100644
--- a/sync/protocol/proto_value_conversions.h
+++ b/sync/protocol/proto_value_conversions.h
@@ -41,6 +41,7 @@ class NigoriSpecifics;
 class PasswordSpecifics;
 class PasswordSpecificsData;
 class PreferenceSpecifics;
+class PushNotificationsSpecifics;
 class SearchEngineSpecifics;
 class SessionHeader;
 class SessionSpecifics;
@@ -157,6 +158,9 @@ base::DictionaryValue* PasswordSpecificsToValue(
 base::DictionaryValue* PreferenceSpecificsToValue(
     const sync_pb::PreferenceSpecifics& password_specifics);
 
+base::DictionaryValue* PushNotificationsSpecificsToValue(
+    const sync_pb::PreferenceSpecifics& push_notifications_specifics);
+
 base::DictionaryValue* SearchEngineSpecificsToValue(
     const sync_pb::SearchEngineSpecifics& search_engine_specifics);