[Fetch] Remove Request.body.

Source/modules/fetch/Request.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/#request-class
 
 typedef (Request or USVString) RequestInfo;
 
 enum RequestMode { "same-origin", "no-cors", "cors" };
 enum RequestCredentials { "omit", "same-origin", "include" };
@@ skipping 10 matching lines @@
     readonly attribute ByteString method;
     readonly attribute USVString url;
     readonly attribute Headers headers;
 
     readonly attribute DOMString referrer;
     readonly attribute RequestMode mode;
     readonly attribute RequestCredentials credentials;
 
     [RaisesException] Request clone();
 
-    // FIXME: Move this attribute into Body when the extended-attribute
-    // is removed.
-    [RuntimeEnabled=ExperimentalStream] readonly attribute ReadableByteStream body;
-
     // FIXME: Implement the following:
     // readonly attribute RequestContext context;
 };
 
 Request implements Body;