spawnUri: fixing test with recent support for multi-script tests.

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.
 #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");
 
 /** Default factory for [Isolate2]. */
 class _IsolateFactory {
 
   factory Isolate2.fromCode(Function topLevelFunction) {
     final name = _IsolateNatives._getJSFunctionName(topLevelFunction);
     if (name == null) {
       throw new UnsupportedOperationException(
           "only top-level functions can be spawned.");
     }
     return new _Isolate2Impl(_IsolateNatives._spawn2(name, null, false));
   }
 
   factory Isolate2.fromUri(String uri) {
     return new _Isolate2Impl(_IsolateNatives._spawn2(null, uri, false));
   }
 }