Rename [packages] to [packageMap] as Isolate.spawnUri parameter.

sdk/lib/_internal/js_runtime/lib/isolate_patch.dart

 // Copyright (c) 2012, 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.
 
 // Patch file for the dart:isolate library.
 
 import 'dart:_js_helper' show patch;
 import 'dart:_isolate_helper' show CapabilityImpl,
                                    IsolateNatives,
                                    ReceivePortImpl,
@@ skipping 59 matching lines @@
   @patch
   static Future<Isolate> spawnUri(
       Uri uri, List<String> args, var message,
       {bool paused: false,
        SendPort onExit,
        SendPort onError,
        bool errorsAreFatal,
        bool checked,
        Map<String, String> environment,
        Uri packageRoot,
-       Map<String, Uri> packages}) {
+       Map<String, Uri> packageMap}) {
     if (environment != null) throw new UnimplementedError("environment");
     if (packageRoot != null) throw new UnimplementedError("packageRoot");
-    if (packages != null) throw new UnimplementedError("packages");
+    if (packageMap != null) throw new UnimplementedError("packageMap");
     bool forcePause = (errorsAreFatal != null) ||
                       (onExit != null) ||
                       (onError != null);
     try {
       if (args is List<String>) {
         for (int i = 0; i < args.length; i++) {
           if (args[i] is! String) {
             throw new ArgumentError("Args must be a list of Strings $args");
           }
         }
@@ skipping 126 matching lines @@
   factory RawReceivePort([void handler(event)]) {
     return new RawReceivePortImpl(handler);
   }
 }
 
 @patch
 class Capability {
   @patch
   factory Capability() = CapabilityImpl;
 }