Revert "Fix observatory tests broken by running dartfmt."

runtime/observatory/tests/observatory_ui/mocks/repositories/heap_snapshot.dart

Index: runtime/observatory/tests/observatory_ui/mocks/repositories/heap_snapshot.dart
diff --git a/runtime/observatory/tests/observatory_ui/mocks/repositories/heap_snapshot.dart b/runtime/observatory/tests/observatory_ui/mocks/repositories/heap_snapshot.dart
index d79ea9f983ad84ff78c989385db80b5731607eb0..42f93e3cbbc981d82f07298f0ada988af38723f9 100644
--- a/runtime/observatory/tests/observatory_ui/mocks/repositories/heap_snapshot.dart
+++ b/runtime/observatory/tests/observatory_ui/mocks/repositories/heap_snapshot.dart
@@ -20,31 +20,28 @@ class HeapSnapshotLoadingProgressMock implements M.HeapSnapshotLoadingProgress {
   final Duration loadingTime;
   final M.HeapSnapshot snapshot;
 
-  const HeapSnapshotLoadingProgressMock(
-      {this.status: M.HeapSnapshotLoadingStatus.fetching,
-      this.progress: 0.0,
-      this.stepDescription: '',
-      this.fetchingTime,
-      this.loadingTime,
+  const HeapSnapshotLoadingProgressMock({
+      this.status : M.HeapSnapshotLoadingStatus.fetching, this.progress: 0.0,
+      this.stepDescription: '', this.fetchingTime, this.loadingTime,
       this.snapshot});
 }
 
-typedef Stream<
-    M
-        .HeapSnapshotLoadingProgressEvent> HeapSnapshotRepositoryMockCallback(
-    M.IsolateRef cls, bool gc);
+typedef Stream<M.HeapSnapshotLoadingProgressEvent>
+    HeapSnapshotRepositoryMockCallback(M.IsolateRef cls, bool gc);
 
-class HeapSnapshotRepositoryMock implements M.HeapSnapshotRepository {
+class HeapSnapshotRepositoryMock
+    implements M.HeapSnapshotRepository {
   final HeapSnapshotRepositoryMockCallback _get;
 
   Stream<M.HeapSnapshotLoadingProgressEvent> get(M.IsolateRef isolate,
-      {bool gc: false}) {
+                                               {bool gc: false}) {
     if (_get != null) {
       return _get(isolate, gc);
     }
     return null;
   }
 
-  HeapSnapshotRepositoryMock({HeapSnapshotRepositoryMockCallback getter})
-      : _get = getter;
+  HeapSnapshotRepositoryMock(
+      {HeapSnapshotRepositoryMockCallback getter})
+    : _get = getter;
 }