Remove library tags, they aren't needed

lib/src/runner/v8_runner.dart

 // Copyright (c) 2015, 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.
 
 /// V8 runner support used by dartdevrun.
-library dev_compiler.src.runner.v8_utils;
 
 import 'dart:async';
 import 'dart:io';
 
 import 'package:path/path.dart';
 import 'package:pub_semver/pub_semver.dart' show Version;
 
 import '../options.dart' show CompilerOptions;
 import 'runtime_utils.dart' show getRuntimeFileAlias;
 
@@ skipping 77 matching lines @@
   @override
   get _v8VersionArgs => ['-p', 'process.versions.v8'];
 
   @override
   _getLoadStatements(List<File> files) => files.map((file) {
         String alias = getRuntimeFileAlias(_options, file);
         return (alias != null ? 'var $alias = ' : '') +
             'require("${file.path}");';
       });
 }