Format all tests.

tests/language/mixin_with_two_implicit_constructors_test.dart

Index: tests/language/mixin_with_two_implicit_constructors_test.dart
diff --git a/tests/language/mixin_with_two_implicit_constructors_test.dart b/tests/language/mixin_with_two_implicit_constructors_test.dart
index 16c3606bd662cb3ba21e6aea54a39505a0e0f761..d532daed842a2a5d6e1009b052a1166f624e6dcb 100644
--- a/tests/language/mixin_with_two_implicit_constructors_test.dart
+++ b/tests/language/mixin_with_two_implicit_constructors_test.dart
@@ -10,11 +10,9 @@ class A {
   A() : field = 2;
 }
 
-class Mixin {
-}
+class Mixin {}
 
-class B extends A with Mixin {
-}
+class B extends A with Mixin {}
 
 main() {
   Expect.equals(2, new B().field);