Format all tests.

tests/language/regress_26543_3_test.dart

 // Copyright (c) 2016, 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. 
+// BSD-style license that can be found in the LICENSE file.
 
 // Regression test for issue 26543
 
 class C {
   var x, y;
-  C() : x = 0, y = null ?? <int, int>{} {}
+  C()
+      : x = 0,
+        y = null ?? <int, int>{} {}
 }
 
 main() {
   print(new C());
-}
+}