pkg/shelf: formatted code

lib/src/shelf_unmodifiable_map.dart

 // Copyright (c) 2014, 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 shelf.shelf_unmodifiable_map;
 
 import 'dart:collection';
 
 import 'package:collection/wrappers.dart' as pc;
 
@@ skipping 29 matching lines @@
     return new ShelfUnmodifiableMap<V>._(source);
   }
 
   ShelfUnmodifiableMap._(Map<String, V> source) : super(source);
 }
 
 /// An const empty implementation of [ShelfUnmodifiableMap].
 // TODO(kevmoo): Consider using MapView from dart:collection which has a const
 // ctor. Would require updating min SDK to 1.5.
 class _EmptyShelfUnmodifiableMap<V> extends pc.DelegatingMap<String, V>
-    implements ShelfUnmodifiableMap<V>  {
+    implements ShelfUnmodifiableMap<V> {
   const _EmptyShelfUnmodifiableMap() : super(const {});
 }