Re-land "Format all multitests"

tests/language/generic_field_mixin6_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // Test that generic types in mixins are handled.
 
 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>;
 
 main() {
   checkNoDynamicTypeError(() => new C1<int>()); // //# 01: continued
   checkDynamicTypeError(() => new C1<String>()); //# 01: continued
 
   checkNoDynamicTypeError(() => new C2()); //      //# 01: continued
 
@@ skipping 10 matching lines @@
   }
   return false;
 }
 
 /// Checks that a dynamic type error is thrown if and only if [f] is executed in
 /// checked mode.
 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.');
   }
 }
 
 /// Checks that no dynamic type error is thrown when [f] is executed regardless
 /// of execution mode.
 void checkNoDynamicTypeError(f(), [String message]) {
   message = message != null ? ': $message' : '';
   try {
     f();
   } on TypeError catch (e) {
     String mode = inCheckedMode() ? 'checked mode' : 'production mode';
     Expect.fail('Unexpected type error in $mode$message.');
   }
 }