[Fetch] Remove Request.body.

Source/modules/fetch/Request.idl

Index: Source/modules/fetch/Request.idl
diff --git a/Source/modules/fetch/Request.idl b/Source/modules/fetch/Request.idl
index 4aacac79c05f6cdeb5cafdd0637caf4d89f85f72..34332105e07fdc3586e36fada6ece6982da89f26 100644
--- a/Source/modules/fetch/Request.idl
+++ b/Source/modules/fetch/Request.idl
@@ -28,10 +28,6 @@ enum RequestCredentials { "omit", "same-origin", "include" };
 
     [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;
 };