Revert "Fix observatory tests broken by running dartfmt."

runtime/observatory/lib/src/repositories/heap_snapshot.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 repositories;
 
 class HeapSnapshotLoadingProgressEvent
     implements M.HeapSnapshotLoadingProgressEvent {
   final HeapSnapshotLoadingProgress progress;
   HeapSnapshotLoadingProgressEvent(this.progress);
@@ skipping 82 matching lines @@
     _onProgress =
         new StreamController<HeapSnapshotLoadingProgressEvent>.broadcast();
     (() async {
       _triggerOnProgress();
       _onProgress.close();
     }());
   }
 }
 
 class HeapSnapshotRepository implements M.HeapSnapshotRepository {
-  Stream<HeapSnapshotLoadingProgressEvent> get(M.IsolateRef i,
-      {M.HeapSnapshotRoots roots: M.HeapSnapshotRoots.vm, bool gc: false}) {
+  Stream<HeapSnapshotLoadingProgressEvent> get(
+      M.IsolateRef i,
+      {M.HeapSnapshotRoots roots: M.HeapSnapshotRoots.vm,
+      bool gc: false}) {
     S.Isolate isolate = i as S.Isolate;
     assert(isolate != null);
     assert(gc != null);
     return new HeapSnapshotLoadingProgress(isolate, roots, gc).onProgress;
   }
 }