Revert "Fix observatory tests broken by running dartfmt."

runtime/observatory/tests/observatory_ui/mocks/objects/isolate.dart

Index: runtime/observatory/tests/observatory_ui/mocks/objects/isolate.dart
diff --git a/runtime/observatory/tests/observatory_ui/mocks/objects/isolate.dart b/runtime/observatory/tests/observatory_ui/mocks/objects/isolate.dart
index c501e8a4646ce00d45eb73df9ff2eea71dd66038..10767df544a9e6ef3191fc0820a662e30e0cd6d8 100644
--- a/runtime/observatory/tests/observatory_ui/mocks/objects/isolate.dart
+++ b/runtime/observatory/tests/observatory_ui/mocks/objects/isolate.dart
@@ -29,20 +29,12 @@ class IsolateMock implements M.Isolate {
   final M.LibraryRef rootLibrary;
   final M.FunctionRef entry;
 
-  const IsolateMock(
-      {this.id: 'i-id',
-      this.number,
-      this.name: 'i-name',
-      this.startTime,
-      this.runnable: true,
-      this.libraries: const [],
-      this.error,
-      this.extensionRPCs: const [],
-      this.counters: const {},
-      this.newSpace: const HeapSpaceMock(),
-      this.oldSpace: const HeapSpaceMock(),
-      this.status: M.IsolateStatus.loading,
-      this.pauseEvent,
-      this.rootLibrary,
-      this.entry});
+  const IsolateMock({this.id: 'i-id', this.number, this.name: 'i-name',
+                     this.startTime, this.runnable: true,
+                     this.libraries: const [], this.error,
+                     this.extensionRPCs: const [], this.counters: const {},
+                     this.newSpace: const HeapSpaceMock(),
+                     this.oldSpace: const HeapSpaceMock(),
+                     this.status: M.IsolateStatus.loading, this.pauseEvent,
+                     this.rootLibrary, this.entry});
 }