Roll 50: Copied IDLs, PYTHON scripts from WebKit removed deleted files in WebCore

modules/nfc/MessageCallback.idl

Index: modules/nfc/MessageCallback.idl
diff --git a/modules/background_sync/PeriodicSyncEventInit.idl b/modules/nfc/MessageCallback.idl
similarity index 54%
copy from modules/background_sync/PeriodicSyncEventInit.idl
copy to modules/nfc/MessageCallback.idl
index 60d2b728b8a9eea69f187c8524845b5210a8c763..edbffe5cb76aeab4711319fdc38acfd98477b80c 100644
--- a/modules/background_sync/PeriodicSyncEventInit.idl
+++ b/modules/nfc/MessageCallback.idl
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-dictionary PeriodicSyncEventInit : ExtendableEventInit {
-    required PeriodicSyncRegistration registration;
+// https://w3c.github.io/web-nfc/#idl-def-messagecallback
+
+callback interface MessageCallback {
+    void handleMessage(NFCMessage message);
 };