Use dartfmt on Observatory code

runtime/observatory/lib/src/models/repositories/sample_profile.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
 
 part of models;
 
-enum SampleProfileTag {
-  userVM,
-  userOnly,
-  vmUser,
-  vmOnly,
-  none
-}
+enum SampleProfileTag { userVM, userOnly, vmUser, vmOnly, none }
 
-enum SampleProfileLoadingStatus {
-  disabled,
-  fetching,
-  loading,
-  loaded
-}
+enum SampleProfileLoadingStatus { disabled, fetching, loading, loaded }
 
 bool isSampleProcessRunning(SampleProfileLoadingStatus status) {
   switch (status) {
     case SampleProfileLoadingStatus.fetching:
     case SampleProfileLoadingStatus.loading:
       return true;
     default:
       return false;
   }
 }
 
 abstract class SampleProfileLoadingProgressEvent {
   SampleProfileLoadingProgress get progress;
 }
 
 abstract class SampleProfileLoadingProgress {
   SampleProfileLoadingStatus get status;
   double get progress;
   Duration get fetchingTime;
   Duration get loadingTime;
   SampleProfile get profile;
 }
 
 abstract class ClassSampleProfileRepository {
-  Stream<SampleProfileLoadingProgressEvent> get(IsolateRef isolate,
-      ClassRef cls, SampleProfileTag tag);
+  Stream<SampleProfileLoadingProgressEvent> get(
+      IsolateRef isolate, ClassRef cls, SampleProfileTag tag);
   Future enable(IsolateRef isolate, ClassRef cls);
   Future disable(IsolateRef isolate, ClassRef cls);
 }
 
 abstract class IsolateSampleProfileRepository {
-  Stream<SampleProfileLoadingProgressEvent> get(IsolateRef isolate,
-      SampleProfileTag tag, {bool clear: false, bool forceFetch: false});
+  Stream<SampleProfileLoadingProgressEvent> get(
+      IsolateRef isolate, SampleProfileTag tag,
+      {bool clear: false, bool forceFetch: false});
 }