Get rid of all the library tags.

lib/src/validator/dependency.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.dependency;
-
 import 'dart:async';
 
 import 'package:pub_semver/pub_semver.dart';
 
 import '../entrypoint.dart';
 import '../log.dart' as log;
 import '../package.dart';
 import '../source/hosted.dart';
 import '../validator.dart';
 
@@ skipping 192 matching lines @@
     errors.add(buffer.toString().trim());
   }
 
   /// Returns the suggested version constraint for a dependency that was tested
   /// against [version].
   String _constraintForVersion(Version version) {
     if (_caretAllowed) return "^$version";
     return '">=$version <${version.nextBreaking}"';
   }
 }