Revert "Fix observatory tests broken by running dartfmt."

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

Index: runtime/observatory/lib/src/elements/stack_trace_tree_config.dart
diff --git a/runtime/observatory/lib/src/elements/stack_trace_tree_config.dart b/runtime/observatory/lib/src/elements/stack_trace_tree_config.dart
index 2dc2b449b7b8dadcd4f264f4d6195a123c232e5f..def0b64be3f5bf6ecebb0f8bba37fd225d3a05b0 100644
--- a/runtime/observatory/lib/src/elements/stack_trace_tree_config.dart
+++ b/runtime/observatory/lib/src/elements/stack_trace_tree_config.dart
@@ -8,10 +8,7 @@ import 'package:observatory/models.dart' as M;
 import 'package:observatory/src/elements/helpers/rendering_scheduler.dart';
 import 'package:observatory/src/elements/helpers/tag.dart';
 
-enum ProfileTreeMode {
-  code,
-  function,
-}
+enum ProfileTreeMode { code, function, }
 
 class StackTraceTreeConfigChangedEvent {
   final StackTraceTreeConfigElement element;
@@ -188,7 +185,8 @@ class StackTraceTreeConfigElement extends HtmlElement implements Renderable {
           _r.dirty();
         })
         ..onChange.map(_toEvent).listen(_triggerModeChange),
-      new SpanElement()..text = ' $modeDescription'
+      new SpanElement()
+        ..text = ' $modeDescription'
     ];
   }
 
@@ -217,7 +215,8 @@ class StackTraceTreeConfigElement extends HtmlElement implements Renderable {
           _r.dirty();
         })
         ..onChange.map(_toEvent).listen(_triggerDirectionChange),
-      new SpanElement()..text = ' $directionDescription'
+      new SpanElement()
+        ..text = ' $directionDescription'
     ];
   }