More fixes.

runtime/bin/builtin.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights solveserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library builtin;
 // NOTE: Do not import 'dart:io' in builtin.
 import 'dart:async';
 import 'dart:collection';
 import 'dart:_internal';
 import 'dart:isolate';
@@ skipping 328 matching lines @@
   VMLibraryHooks.resourceReadAsBytes = _resourceReadAsBytes;
 
   VMLibraryHooks.packageRootUriFuture = _getPackageRootFuture;
   VMLibraryHooks.packageConfigUriFuture = _getPackageConfigFuture;
   VMLibraryHooks.resolvePackageUriFuture = _resolvePackageUriFuture;
 }
 
 // Handling of Resource class by dispatching to the load port.
 Future<List<int>> _resourceReadAsBytes(Uri uri) async {
   List response = await _makeLoaderRequest(_Dart_kResourceLoad, uri.toString());
-  if (response[3] is String) {
+  if (response[4] is String) {
     // Throw the error.
-    throw response[3];
+    throw response[4];
   } else {
-    return response[3];
+    return response[4];
   }
 }
 
 Future<Uri> _getPackageRootFuture() {
   if (_traceLoading) {
     _log("Request for package root from user code.");
   }
   return _makeLoaderRequest(_Dart_kGetPackageRootUri, null);
 }
 
@@ skipping 22 matching lines @@
     if (_traceLoading) {
       _log("Exception when resolving package URI: $packageUri");
     }
     result = null;
   }
   if (_traceLoading) {
     _log("Resolved '$packageUri' to '$result'");
   }
   return result;
 }