Format all tests.

tests/language/issue12284_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";
 import "compiler_annotations.dart";
 
 class A {
   int field;
 
   @DontInline()
   A(param) {
     // Currently defeat inlining by using a closure.
-    var bar = () => 42;     
+    var bar = () => 42;
     field = param + 42;
   }
   A.redirect() : this('foo');
 }
 
 main() {
   Expect.equals(42 + 42, new A(42).field);
-  Expect.throws(() => new A.redirect(),
-                (e) => e is ArgumentError || e is TypeError);
+  Expect.throws(
+      () => new A.redirect(), (e) => e is ArgumentError || e is TypeError);
 }