Update utils to new library syntax.

utils/lib/file_system_vm.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.
 
 // TODO(terry): Investigate common library for file I/O shared between frog and tools.
 
-#library('file_system_vm');
-#import('dart:io');
-#import('file_system.dart');
-#import('dart:utf');
+library file_system_vm;
+import 'dart:io';
+import 'file_system.dart';
+import 'dart:utf';
 
 /** File system implementation using the vm api's. */
 class VMFileSystem implements FileSystem {
   void writeString(String path, String text) {
     var file = new File(path).openSync(FileMode.WRITE);
     file.writeStringSync(text);
     file.closeSync();
   }
 
   String readAll(String filename) {
@@ skipping 12 matching lines @@
   void createDirectory(String path, [bool recursive = false]) {
     // TODO(rnystrom): Implement.
     throw 'createDirectory() is not implemented by VMFileSystem yet.';
   }
 
   void removeDirectory(String path, [bool recursive = false]) {
     // TODO(rnystrom): Implement.
     throw 'removeDirectory() is not implemented by VMFileSystem yet.';
   }
 }