dart2js: run dartfmt on tests

tests/compiler/dart2js_extra/lookup_map/live_entry_through_mirrors_used_test.dart

Index: tests/compiler/dart2js_extra/lookup_map/live_entry_through_mirrors_used_test.dart
diff --git a/tests/compiler/dart2js_extra/lookup_map/live_entry_through_mirrors_used_test.dart b/tests/compiler/dart2js_extra/lookup_map/live_entry_through_mirrors_used_test.dart
index c5b752c1c94030a7eb847f2e899107c20dd4e22f..991934d67ac29f29ce7682be2640bdb595fd0db3 100644
--- a/tests/compiler/dart2js_extra/lookup_map/live_entry_through_mirrors_used_test.dart
+++ b/tests/compiler/dart2js_extra/lookup_map/live_entry_through_mirrors_used_test.dart
@@ -12,17 +12,21 @@ import 'package:expect/expect.dart';
 @MirrorsUsed(targets: const [A])
 import 'dart:mirrors';
 
-class A{}
-class B{}
+class A {}
+
+class B {}
+
 const map = const LookupMap(const [
-    A, "the-text-for-A",
-    B, "the-text-for-B",
+  A,
+  "the-text-for-A",
+  B,
+  "the-text-for-B",
 ]);
 
 main() {
   // `A` is included by @MirrorsUsed, so its entry is retained too.
-  LibraryMirror lib = currentMirrorSystem().findLibrary(
-      #live_entry_through_mirrors_used_test);
+  LibraryMirror lib =
+      currentMirrorSystem().findLibrary(#live_entry_through_mirrors_used_test);
   ClassMirror aClass = lib.declarations[#A];
   Expect.equals(map[aClass.reflectedType], "the-text-for-A");
 }