Regenerate pub sources.

sdk/lib/_internal/pub_generated/lib/src/validator/utf8_readme.dart

Index: sdk/lib/_internal/pub_generated/lib/src/validator/utf8_readme.dart
diff --git a/sdk/lib/_internal/pub_generated/lib/src/validator/utf8_readme.dart b/sdk/lib/_internal/pub_generated/lib/src/validator/utf8_readme.dart
index d840dffdec89a35071c36b887a8e47b3f5db0716..c3e2bf7617ac390f2db6d278e931327aeb7c3d9a 100644
--- a/sdk/lib/_internal/pub_generated/lib/src/validator/utf8_readme.dart
+++ b/sdk/lib/_internal/pub_generated/lib/src/validator/utf8_readme.dart
@@ -1,17 +1,28 @@
+// 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.
+
 library pub.validator.utf8_readme;
+
 import 'dart:async';
 import 'dart:convert';
+
 import '../entrypoint.dart';
 import '../io.dart';
 import '../validator.dart';
+
+/// Validates that a package's README is valid utf-8.
 class Utf8ReadmeValidator extends Validator {
-  Utf8ReadmeValidator(Entrypoint entrypoint) : super(entrypoint);
+  Utf8ReadmeValidator(Entrypoint entrypoint)
+      : super(entrypoint);
+
   Future validate() {
     return new Future.sync(() {
       var readme = entrypoint.root.readmePath;
       if (readme == null) return;
       var bytes = readBinaryFile(readme);
       try {
+        // UTF8.decode doesn't allow invalid UTF-8.
         UTF8.decode(bytes);
       } on FormatException catch (_) {
         warnings.add(
@@ -21,3 +32,4 @@ class Utf8ReadmeValidator extends Validator {
     });
   }
 }
+