Format all remaining unformatted runtime files other than multitests.

runtime/observatory/lib/src/elements/nav/vm_menu.dart

 // Copyright (c) 2016, 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.
 
 import 'dart:html';
 import 'dart:async';
 import 'package:observatory/models.dart' as M show VM, EventRepository;
 import 'package:observatory/src/elements/helpers/nav_menu.dart';
 import 'package:observatory/src/elements/helpers/rendering_scheduler.dart';
 import 'package:observatory/src/elements/helpers/tag.dart';
@@ skipping 49 matching lines @@
     super.detached();
     children = [];
     _r.disable(notify: true);
     _updatesSubscription.cancel();
   }
 
   void render() {
     final content = (_vm.isolates.map((isolate) {
       return new NavMenuItemElement(isolate.name,
           queue: _r.queue, link: Uris.inspect(isolate));
-    }).toList()..addAll(_content));
+    }).toList()
+      ..addAll(_content));
     children = [navMenu(vm.displayName, link: Uris.vm(), content: content)];
   }
 }