Support loading binary data in dart2js

tests/compiler/dart2js/package_root_test.dart

 // Copyright (c) 2013, 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.
 
 // Test that the compiler can handle imports when package root has not been set.
 
 library dart2js.test.package_root;
 
 import 'dart:async';
 
@@ skipping 40 matching lines @@
 
 void main() {
   asyncTest(() async {
     Uri script = currentDirectory.resolveUri(Platform.script);
     Uri packageRoot = script.resolve('./packages/');
 
     PackagesDiscoveryProvider noPackagesDiscovery = (Uri uri) {
       return new Future.value(Packages.noPackages);
     };
 
-    await runTest(Uri.parse('memory:main.dart'), MessageKind.READ_SCRIPT_ERROR,
+    await runTest(Uri.parse('memory:main.dart'), MessageKind.READ_URI_ERROR,
         packageRoot: packageRoot);
     await runTest(Uri.parse('memory:main.dart'), MessageKind.LIBRARY_NOT_FOUND,
         packageConfig: PACKAGE_CONFIG_URI);
     await runTest(Uri.parse('memory:main.dart'), MessageKind.LIBRARY_NOT_FOUND,
         packagesDiscoveryProvider: noPackagesDiscovery);
 
     await runTest(
         Uri.parse('package:foo/foo.dart'), MessageKind.READ_SELF_ERROR,
         packageRoot: packageRoot);
     await runTest(
         Uri.parse('package:foo/foo.dart'), MessageKind.LIBRARY_NOT_FOUND,
         packageConfig: PACKAGE_CONFIG_URI);
     await runTest(
         Uri.parse('package:foo/foo.dart'), MessageKind.LIBRARY_NOT_FOUND,
         packagesDiscoveryProvider: noPackagesDiscovery);
   });
 }