Format all tests.

tests/language_strong/mixin_mixin6_test.dart

Index: tests/language_strong/mixin_mixin6_test.dart
diff --git a/tests/language_strong/mixin_mixin6_test.dart b/tests/language_strong/mixin_mixin6_test.dart
index b0cb4dcebfb70af9123d3b69d28301394b71d4d4..65a32ddeefa804ca3c05ffc821e571a0d34fa011 100644
--- a/tests/language_strong/mixin_mixin6_test.dart
+++ b/tests/language_strong/mixin_mixin6_test.dart
@@ -4,23 +4,25 @@
 
 import "package:expect/expect.dart";
 
-class I<T> { }
+class I<T> {}
 
-class J<T> { }
+class J<T> {}
 
-class K<T> { }
+class K<T> {}
 
-class S<T> { }
+class S<T> {}
 
 class M<T> {
-  m() { return T; }
+  m() {
+    return T;
+  }
 }
 
 class A<U, V> = Object with M<Map<U, V>> implements I<V>;
 
 class B<T> = Object with A<T, Set<T>> implements J<T>;
 
-class C<T> = S<List<T>> with B implements K<T>;  // B is raw.
+class C<T> = S<List<T>> with B implements K<T>; // B is raw.
 
 main() {
   var c = new C<int>();