Support loading binary data in dart2js

tests/compiler/dart2js/missing_file_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.missing_file;
 
 import 'dart:async';
 import 'package:async_helper/async_helper.dart';
@@ skipping 36 matching lines @@
   if (info != null) {
     Expect.equals(info, diagnostics.infos.first.message.kind);
   }
   Expect.equals(0, diagnostics.warnings.length);
   Expect.equals(0, diagnostics.hints.length);
 }
 
 void main() {
   asyncTest(() async {
     await runTest(Uri.parse('memory:main.dart'),
-        error: MessageKind.READ_SCRIPT_ERROR);
+        error: MessageKind.READ_URI_ERROR);
 
     await runTest(Uri.parse('memory:foo.dart'),
         error: MessageKind.READ_SELF_ERROR);
 
     await runTest(Uri.parse('dart:foo'), error: MessageKind.LIBRARY_NOT_FOUND);
 
     await runTest(Uri.parse('dart:_mirror_helper'),
         error: MessageKind.INTERNAL_LIBRARY,
         info: MessageKind.DISALLOWED_LIBRARY_IMPORT);
 
     await runTest(Uri.parse('memory:bar.dart'),
         error: MessageKind.LIBRARY_NOT_FOUND);
 
     // Importing dart:io is temporarily allowed as a stopgap measure for the
     // lack of config specific imports. Once that is added, this will be
     // disallowed again.
 
     //await runTest(Uri.parse('dart:io'),
     //    error: MessageKind.LIBRARY_NOT_SUPPORTED,
     //    info: MessageKind.DISALLOWED_LIBRARY_IMPORT);
 
     //await runTest(Uri.parse('memory:baz.dart'),
     //    error: MessageKind.LIBRARY_NOT_SUPPORTED,
     //    info: MessageKind.DISALLOWED_LIBRARY_IMPORT);
   });
 }