Use dartfmt on Observatory code

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

Index: runtime/observatory/lib/src/elements/context_ref.dart
diff --git a/runtime/observatory/lib/src/elements/context_ref.dart b/runtime/observatory/lib/src/elements/context_ref.dart
index 90138bb7636f2dc9627bcd44bfab15f4a8a8d0d0..7628396a9a7d347c8843ad5ac4f7f92c42b91f08 100644
--- a/runtime/observatory/lib/src/elements/context_ref.dart
+++ b/runtime/observatory/lib/src/elements/context_ref.dart
@@ -4,8 +4,7 @@
 
 import 'dart:html';
 import 'dart:async';
-import 'package:observatory/models.dart' as M
-  show IsolateRef, ContextRef;
+import 'package:observatory/models.dart' as M show IsolateRef, ContextRef;
 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';
@@ -53,7 +52,9 @@ class ContextRefElement extends HtmlElement implements Renderable {
     children = [
       new AnchorElement(href: Uris.inspect(_isolate, object: _context))
         ..children = [
-          new SpanElement()..classes = ['emphasize']..text = 'Context',
+          new SpanElement()
+            ..classes = ['emphasize']
+            ..text = 'Context',
           new SpanElement()..text = ' (${_context.length})'
         ]
     ];