Format all tests.

tests/language/proxy4_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.
 
 // Test for static warnings for member access on classes that inherit a
 // user defined noSuchMethod.
 
 class Mock {
   noSuchMethod(i) => 42;
 }
 
-abstract class Foo { int foo(); }
+abstract class Foo {
+  int foo();
+}
 
 class DontWarnMe extends Mock implements Foo {}
 
 main() {
   print(new DontWarnMe().foo());
-}
+}