Updated to Chrome 45 (2454) moved from SVN to git.

modules/background_sync/SyncRegistration.idl

Index: modules/background_sync/SyncRegistration.idl
diff --git a/modules/background_sync/SyncRegistration.idl b/modules/background_sync/SyncRegistration.idl
new file mode 100644
index 0000000000000000000000000000000000000000..171e3e49a46af4ad6f66fcb1d8e167295789ccbf
--- /dev/null
+++ b/modules/background_sync/SyncRegistration.idl
@@ -0,0 +1,12 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+[
+    Exposed=(Window,ServiceWorker),
+    GarbageCollected,
+    RuntimeEnabled=BackgroundSync,
+] interface SyncRegistration {
+    [RuntimeEnabled=BackgroundSyncV2] readonly attribute DOMString tag;
+    [CallWith=ScriptState] Promise<boolean> unregister();
+};