Format all tests.

tests/language/mixin_type_parameters_simple_test.dart

 // Copyright (c) 2013, 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.
 
 import "package:expect/expect.dart";
 
 class S {}
 
 class M1<X> {
   m1() => X;
 }
 
 class M2<Y> {
   m2() => Y;
 }
 
-class A<T> extends S with M1<T> , M2<T> { }
+class A<T> extends S with M1<T>, M2<T> {}
 
 main() {
   var a = new A<int>();
   // Getting "int" when calling toString() on the int type is not required.
   // However, we want to keep the original names for the most common core types
   // so we make sure to handle these specifically in the compiler.
   Expect.equals("int", a.m1().toString());
   Expect.equals("int", a.m2().toString());
   a = new A<String>();
   Expect.equals("String", a.m1().toString());
   Expect.equals("String", a.m2().toString());
 }