Use dartfmt on Observatory code

runtime/observatory/lib/src/models/repositories/heap_snapshot.dart

Index: runtime/observatory/lib/src/models/repositories/heap_snapshot.dart
diff --git a/runtime/observatory/lib/src/models/repositories/heap_snapshot.dart b/runtime/observatory/lib/src/models/repositories/heap_snapshot.dart
index 66dc5b83f7e89e61ed7f4ce105d832ad802cd9fc..da71fe97e60215f53a73069628d3292b0895b466 100644
--- a/runtime/observatory/lib/src/models/repositories/heap_snapshot.dart
+++ b/runtime/observatory/lib/src/models/repositories/heap_snapshot.dart
@@ -4,11 +4,7 @@
 
 part of models;
 
-enum HeapSnapshotLoadingStatus {
-  fetching,
-  loading,
-  loaded
-}
+enum HeapSnapshotLoadingStatus { fetching, loading, loaded }
 
 bool isHeapSnapshotProgressRunning(HeapSnapshotLoadingStatus status) {
   switch (status) {
@@ -35,5 +31,5 @@ abstract class HeapSnapshotLoadingProgress {
 
 abstract class HeapSnapshotRepository {
   Stream<HeapSnapshotLoadingProgressEvent> get(IsolateRef isolate,
-                                               {bool gc: false});
+      {bool gc: false});
 }