[Fetch API] Put body members directly on Response/Request

Source/modules/serviceworkers/Body.idl

Index: Source/modules/serviceworkers/Body.idl
diff --git a/Source/modules/serviceworkers/FetchBodyStream.idl b/Source/modules/serviceworkers/Body.idl
similarity index 50%
rename from Source/modules/serviceworkers/FetchBodyStream.idl
rename to Source/modules/serviceworkers/Body.idl
index 5e5bf66364f0996466af1439635dcee15ab674ca..bb065791d04e55f218b92ad03f7326e013e3e5db 100644
--- a/Source/modules/serviceworkers/FetchBodyStream.idl
+++ b/Source/modules/serviceworkers/Body.idl
@@ -2,20 +2,20 @@
 // 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/#fetchbodystream
+// http://fetch.spec.whatwg.org/#body
 [
     RuntimeEnabled=ServiceWorker,
     Exposed=ServiceWorker,
     NoInterfaceObject,
     ActiveDOMObject,
     GarbageCollected,
-] interface FetchBodyStream {
-    [CallWith=ScriptState] Promise asArrayBuffer();
-    [CallWith=ScriptState] Promise asBlob();
-    [CallWith=ScriptState] Promise asJSON();
-    [CallWith=ScriptState] Promise asText();
+] 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 asFormData();
+    // [CallWith=ScriptState] Promise formData();
 };
-