Move IDLs to 39 roll

modules/serviceworkers/Body.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.
+
+// http://fetch.spec.whatwg.org/#body
+[
+    RuntimeEnabled=ServiceWorker,
+    Exposed=ServiceWorker,
+    NoInterfaceObject,
+    ActiveDOMObject,
+    GarbageCollected,
+] interface Body {
+    readonly attribute boolean bodyUsed;
+    [CallWith=ScriptState] Promise arrayBuffer();
+    [CallWith=ScriptState] Promise blob();
+    [CallWith=ScriptState] Promise json();
+    [CallWith=ScriptState] Promise text();
+
+    // Still to be implemented.
+    // [CallWith=ScriptState] Promise formData();
+};