Separate the syncing of extension settings and app settings into separate data

chrome/browser/sync/protocol/proto_value_conversions.h

Index: chrome/browser/sync/protocol/proto_value_conversions.h
diff --git a/chrome/browser/sync/protocol/proto_value_conversions.h b/chrome/browser/sync/protocol/proto_value_conversions.h
index bb69a2e3ddcb53c6a4ef9eafe766d27aafb59678..ed05d9db84945066c1eb623e4ceaa4b0da0eb674 100644
--- a/chrome/browser/sync/protocol/proto_value_conversions.h
+++ b/chrome/browser/sync/protocol/proto_value_conversions.h
@@ -14,6 +14,7 @@ class DictionaryValue;
 
 namespace sync_pb {
 class AppNotificationSpecifics;
+class AppSettingSpecifics;
 class AppSpecifics;
 class AutofillProfileSpecifics;
 class AutofillSpecifics;
@@ -78,6 +79,9 @@ base::DictionaryValue* PasswordSpecificsDataToValue(
 base::DictionaryValue* AppNotificationSpecificsToValue(
     const sync_pb::AppNotificationSpecifics& app_notification_specifics);
 
+base::DictionaryValue* AppSettingSpecificsToValue(
+    const sync_pb::AppSettingSpecifics& app_setting_specifics);
+
 base::DictionaryValue* AppSpecificsToValue(
     const sync_pb::AppSpecifics& app_specifics);