dart2js: run dartfmt on tests

tests/compiler/dart2js_extra/mirror_invalid_field_access_test.dart

Index: tests/compiler/dart2js_extra/mirror_invalid_field_access_test.dart
diff --git a/tests/compiler/dart2js_extra/mirror_invalid_field_access_test.dart b/tests/compiler/dart2js_extra/mirror_invalid_field_access_test.dart
index 63bffcd93e63a5ffde3c8fe312b399372c53f866..15e7099682a8a7d6c1d53f6ef9c7ba64c490abbf 100644
--- a/tests/compiler/dart2js_extra/mirror_invalid_field_access_test.dart
+++ b/tests/compiler/dart2js_extra/mirror_invalid_field_access_test.dart
@@ -22,8 +22,8 @@ main() {
   var mirror = currentMirrorSystem().findLibrary(const Symbol('test'));
   Expect.equals(1, mirror.setField(const Symbol('foo'), 1).reflectee);
   Expect.equals(1, mirror.getField(const Symbol('foo')).reflectee);
-  Expect.throws(() => mirror.setField(const Symbol('bar'),  2),
-                (e) => e is NoSuchMethodError);
+  Expect.throws(() => mirror.setField(const Symbol('bar'), 2),
+      (e) => e is NoSuchMethodError);
   Expect.throws(() => mirror.getField(const Symbol('bar')),
-                (e) => e is NoSuchMethodError);
+      (e) => e is NoSuchMethodError);
 }