Regenerate pub sources.

sdk/lib/_internal/pub_generated/test/dart2js/source_maps_include_core_libs_test.dart

Index: sdk/lib/_internal/pub_generated/test/dart2js/source_maps_include_core_libs_test.dart
diff --git a/sdk/lib/_internal/pub_generated/test/dart2js/source_maps_include_core_libs_test.dart b/sdk/lib/_internal/pub_generated/test/dart2js/source_maps_include_core_libs_test.dart
index b685b623d59f8187da32f703418e9b7a3b2b867c..6e0647f669df45663c38b47431850d20d12121bd 100644
--- a/sdk/lib/_internal/pub_generated/test/dart2js/source_maps_include_core_libs_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/dart2js/source_maps_include_core_libs_test.dart
@@ -1,8 +1,19 @@
+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS d.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.
+
 import 'package:scheduled_test/scheduled_test.dart';
+
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
+
 main() {
   initConfig();
+
+  // This test is a bit shaky. Since dart2js is free to inline things, it's
+  // not precise as to which source libraries will actually be referenced in
+  // the source map. But this tries to use a type in the core library
+  // (StringBuffer) and validate that its source ends up in the source map.
   integration("Dart core libraries are available to source maps", () {
     d.dir(
         appPath,
@@ -18,10 +29,12 @@ main() {
                             d.file(
                                 "main.dart",
                                 "main() => new StringBuffer().writeAll(['s']);")])])]).create();
+
     schedulePub(
         args: ["build", "--mode", "debug"],
         output: new RegExp(r'Built \d+ files to "build".'),
         exitCode: 0);
+
     d.dir(
         appPath,
         [