Format all tests.

tests/language_strong/mixin_mixin5_test.dart

Index: tests/language_strong/mixin_mixin5_test.dart
diff --git a/tests/language_strong/mixin_mixin5_test.dart b/tests/language_strong/mixin_mixin5_test.dart
index a97e00d1766fd1931f51b5b7dd27da8955d2e0c1..064f53b737448e9de40a76f16e6d1fb76f916443 100644
--- a/tests/language_strong/mixin_mixin5_test.dart
+++ b/tests/language_strong/mixin_mixin5_test.dart
@@ -4,16 +4,18 @@
 
 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>;