Re-land "Format all multitests"

tests/language/generic_field_mixin6_test.dart

Index: tests/language/generic_field_mixin6_test.dart
diff --git a/tests/language/generic_field_mixin6_test.dart b/tests/language/generic_field_mixin6_test.dart
index 664246a9042cd00aca6c660999a3eb8e8ca38b53..8778ea9574ab7eef6fdd2c10e007c0e6cfb7deb4 100644
--- a/tests/language/generic_field_mixin6_test.dart
+++ b/tests/language/generic_field_mixin6_test.dart
@@ -9,7 +9,9 @@ import 'package:expect/expect.dart';
 class M<T> {
   T field = 0; //# 01: static type warning
 }
+
 class A<U> {}
+
 class C1<V> = Object with M<V>;
 class C2 = Object with M<int>;
 class C3 = Object with M<String>;
@@ -40,11 +42,10 @@ void checkDynamicTypeError(f(), [String message]) {
   message = message != null ? ': $message' : '';
   try {
     f();
-    Expect.isFalse(inCheckedMode(),
-      'Missing type error in checked mode$message.');
+    Expect.isFalse(
+        inCheckedMode(), 'Missing type error in checked mode$message.');
   } on TypeError catch (e) {
-    Expect.isTrue(inCheckedMode(),
-      'Unexpected type error in production mode.');
+    Expect.isTrue(inCheckedMode(), 'Unexpected type error in production mode.');
   }
 }