Use dartfmt on Observatory code

runtime/observatory/lib/src/elements/unknown_ref.dart

 // Copyright (c) 2013, 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 IsolateRef, UnknownObjectRef;
+import 'package:observatory/models.dart' as M show IsolateRef, UnknownObjectRef;
 import 'package:observatory/src/elements/helpers/rendering_scheduler.dart';
 import 'package:observatory/src/elements/helpers/tag.dart';
 import 'package:observatory/src/elements/helpers/uris.dart';
 
 class UnknownObjectRefElement extends HtmlElement implements Renderable {
   static const tag = const Tag<UnknownObjectRefElement>('unknown-ref');
 
   RenderingScheduler<UnknownObjectRefElement> _r;
 
   Stream<RenderedEvent<UnknownObjectRefElement>> get onRendered =>
       _r.onRendered;
 
   M.IsolateRef _isolate;
   M.UnknownObjectRef _obj;
 
   M.IsolateRef get isolate => _isolate;
   M.UnknownObjectRef get obj => _obj;
 
-  factory UnknownObjectRefElement(M.IsolateRef isolate,
-      M.UnknownObjectRef obj, {RenderingQueue queue}) {
+  factory UnknownObjectRefElement(M.IsolateRef isolate, M.UnknownObjectRef obj,
+      {RenderingQueue queue}) {
     assert(isolate != null);
     assert(obj != null);
     UnknownObjectRefElement e = document.createElement(tag.name);
     e._r = new RenderingScheduler(e, queue: queue);
     e._isolate = isolate;
     e._obj = obj;
     return e;
   }
 
   UnknownObjectRefElement.created() : super.created();
@@ skipping 11 matching lines @@
     children = [];
   }
 
   void render() {
     children = [
       new AnchorElement(href: Uris.inspect(_isolate, object: _obj))
         ..text = _obj.vmType
     ];
   }
 }