Remove library tags, they aren't needed

lib/src/utils.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.
 
 /// Holds a couple utility functions used at various places in the system.
-library dev_compiler.src.utils;
 
 import 'dart:io';
 
 import 'package:path/path.dart' as path;
 import 'package:analyzer/src/generated/ast.dart'
     show
         ImportDirective,
         ExportDirective,
         PartDirective,
         CompilationUnit,
@@ skipping 425 matching lines @@
             '(expected one of ${enumValues.map(getEnumName)})'));
 
 /// Gets the "simple" name of an enum value.
 getEnumName(v) {
   var parts = '$v'.split('.');
   if (parts.length != 2 || !parts.every((p) => p.isNotEmpty)) {
     throw new ArgumentError('Invalid enum value: $v');
   }
   return parts[1];
 }