Use dartfmt on Observatory code

runtime/observatory/lib/src/repositories/target.dart

Index: runtime/observatory/lib/src/repositories/target.dart
diff --git a/runtime/observatory/lib/src/repositories/target.dart b/runtime/observatory/lib/src/repositories/target.dart
index bb011600039f690113782b79570a3276326593bf..cad6dc5131b2367d1456b77c493e491aea7e4651 100644
--- a/runtime/observatory/lib/src/repositories/target.dart
+++ b/runtime/observatory/lib/src/repositories/target.dart
@@ -11,7 +11,6 @@ class TargetChangeEvent implements M.TargetChangeEvent {
 }
 
 class TargetRepository implements M.TargetRepository {
-
   static const _historyKey = 'history';
 
   final StreamController<TargetChangeEvent> _onChange;
@@ -82,13 +81,13 @@ class TargetRepository implements M.TargetRepository {
     }
     _list.addAll(loaded.map((i) => new SC.WebSocketVMTarget.fromMap(i)));
     _list.sort((SC.WebSocketVMTarget a, SC.WebSocketVMTarget b) {
-       return b.lastConnectionTime.compareTo(a.lastConnectionTime);
+      return b.lastConnectionTime.compareTo(a.lastConnectionTime);
     });
   }
 
   /// After making a change, update settings.
   void _store() {
-    _settings.set(_historyKey,  _list);
+    _settings.set(_historyKey, _list);
   }
 
   /// Find by networkAddress.