Use dartfmt on Observatory code

runtime/observatory/lib/src/elements/source_link.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.
 
 library source_link_element;
 
 import 'dart:html';
 import 'dart:async';
 import 'package:observatory/models.dart'
-  show IsolateRef, SourceLocation, Script, ScriptRepository;
+    show IsolateRef, SourceLocation, Script, ScriptRepository;
 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 SourceLinkElement extends HtmlElement implements Renderable {
   static const tag = const Tag<SourceLinkElement>('source-link');
 
   RenderingScheduler _r;
 
   Stream<RenderedEvent<SourceLinkElement>> get onRendered => _r.onRendered;
 
   IsolateRef _isolate;
   SourceLocation _location;
   Script _script;
   ScriptRepository _repository;
 
   IsolateRef get isolate => _isolate;
   SourceLocation get location => _location;
 
-  factory SourceLinkElement(IsolateRef isolate, SourceLocation location,
-      ScriptRepository repository, {RenderingQueue queue}) {
+  factory SourceLinkElement(
+      IsolateRef isolate, SourceLocation location, ScriptRepository repository,
+      {RenderingQueue queue}) {
     assert(isolate != null);
     assert(location != null);
     SourceLinkElement e = document.createElement(tag.name);
     e._r = new RenderingScheduler(e, queue: queue);
     e._isolate = isolate;
     e._location = location;
     e._repository = repository;
     return e;
   }
 
@@ skipping 26 matching lines @@
       int column = _script.tokenToCol(token);
       children = [
         new AnchorElement(
             href: Uris.inspect(isolate, object: _script, pos: token))
           ..title = _script.uri
           ..text = '${label}:${line}:${column}'
       ];
     }
   }
 }