Format all tests.

tests/language/constructor_with_mixin_test.dart

 // Copyright (c) 2015, 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 super constructor invocation with mixins.
 // Regression test for issue dartbug.com/22604
 
 import "package:expect/expect.dart";
 
 var a_count = 0;
 var b_count = 0;
 
 class A {
   final int x;
   A(int this.x) {
     a_count++;
   }
 }
 
-class I { }
+class I {}
 
 class B extends A with I {
   int y;
 
-  B(int xx) : super(xx), y = 13 {
+  B(int xx)
+      : super(xx),
+        y = 13 {
     b_count++;
   }
 }
 
 void main() {
   var b = new B(17);
   Expect.equals(1, a_count);
   Expect.equals(1, b_count);
 }
-