Move IDLs to 39 roll

modules/netinfo/NetworkInformation.idl

 // Copyright 2014 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.
 
 enum ConnectionType {
     "cellular",
     "bluetooth",
     "ethernet",
     "wifi",
     "other",
     "none",
     "unknown"
 };
 
 [
     RuntimeEnabled=NetworkInformation,
     Exposed=(Window,Worker),
-    WillBeGarbageCollected,
+    GarbageCollected,
     ActiveDOMObject
 ] interface NetworkInformation : EventTarget {
     readonly attribute ConnectionType type;
     attribute EventHandler ontypechange;
 };