dart2js: run dartfmt on tests

tests/compiler/dart2js_extra/mirror_invalid_invoke3_test.dart

Index: tests/compiler/dart2js_extra/mirror_invalid_invoke3_test.dart
diff --git a/tests/compiler/dart2js_extra/mirror_invalid_invoke3_test.dart b/tests/compiler/dart2js_extra/mirror_invalid_invoke3_test.dart
index 4236b3fd0bee51d64dc644332db63551dff3c63e..9ddd4e553ae60b3e38c6b65e4070cceedc01fea4 100644
--- a/tests/compiler/dart2js_extra/mirror_invalid_invoke3_test.dart
+++ b/tests/compiler/dart2js_extra/mirror_invalid_invoke3_test.dart
@@ -23,10 +23,10 @@ class C {
 }
 
 main() {
-  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(new C()).type; // Workaround bug 12799.
   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);
 }