Get rid of all the library tags.

lib/src/validator.dart

 // Copyright (c) 2012, 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;
-
 import 'dart:async';
 
 import 'entrypoint.dart';
 import 'log.dart' as log;
 import 'utils.dart';
 import 'validator/compiled_dartdoc.dart';
 import 'validator/dependency.dart';
 import 'validator/dependency_override.dart';
 import 'validator/directory.dart';
 import 'validator/executable.dart';
@@ skipping 78 matching lines @@
         for (var warning in warnings) {
           log.warning("* ${warning.split('\n').join('\n  ')}");
         }
         log.warning("");
       }
 
       return new Pair<List<String>, List<String>>(errors, warnings);
     });
   }
 }