Isolate library changes for leg support.

lib/isolate/isolate_frog.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 // Dart isolate's API and implementation for frog. Since dartdocs are generated
 // using frog, we include here some additional library level comments.
 
 /**
  * The `dart:isolate` library defines APIs to spawn and communicate with
@@ skipping 28 matching lines @@
  */
 #library("dart:isolate");
 
 #import("../uri/uri.dart");
 #source("isolate_api.dart");
 #source("frog/compiler_hooks.dart");
 #source("frog/isolateimpl.dart");
 #source("frog/ports.dart");
 #source("frog/messages.dart");
 #native("frog/natives.js");
-
-ReceivePort _port;
-
-SendPort _spawnFunction(void topLevelFunction()) {
-  final name = _IsolateNatives._getJSFunctionName(topLevelFunction);
-  if (name == null) {
-    throw new UnsupportedOperationException(
-        "only top-level functions can be spawned.");
-  }
-  return _IsolateNatives._spawn2(name, null, false);
-}
-
-SendPort _spawnUri(String uri) {
-  return _IsolateNatives._spawn2(null, uri, false);
-}