dart2js: run dartfmt on tests

tests/compiler/dart2js_extra/mirror_invalid_invoke2_test.dart

Index: tests/compiler/dart2js_extra/mirror_invalid_invoke2_test.dart
diff --git a/tests/compiler/dart2js_extra/mirror_invalid_invoke2_test.dart b/tests/compiler/dart2js_extra/mirror_invalid_invoke2_test.dart
index 49b74cfc1682efd352c506df9b2e42946a2e798b..774c7280160e8e6ef56a865c8f08083a07cfe50f 100644
--- a/tests/compiler/dart2js_extra/mirror_invalid_invoke2_test.dart
+++ b/tests/compiler/dart2js_extra/mirror_invalid_invoke2_test.dart
@@ -24,10 +24,10 @@ class C {
 
 main() {
   var c = new C();
-  c.bar();  // Call bar, so it is included in the program.
+  c.bar(); // Call bar, so it is included in the program.
 
   var mirror = reflect(c);
   Expect.equals(1, mirror.invoke(const Symbol('foo'), []).reflectee);
-  Expect.throws(() => mirror.invoke(const Symbol('bar'),  []),
-                (e) => e is NoSuchMethodError);
+  Expect.throws(() => mirror.invoke(const Symbol('bar'), []),
+      (e) => e is NoSuchMethodError);
 }