Format all tests.

tests/corelib/set_contains_test.dart

Index: tests/corelib/set_contains_test.dart
diff --git a/tests/corelib/set_contains_test.dart b/tests/corelib/set_contains_test.dart
index 07670a3bd6a232fa0f5da09c7bd4328c05c14b74..c955374e999ae9d2fea3ae38242fd5972d85fa4d 100644
--- a/tests/corelib/set_contains_test.dart
+++ b/tests/corelib/set_contains_test.dart
@@ -4,14 +4,19 @@
 
 import "package:expect/expect.dart";
 
-class A { const A(); }
-class B extends A { const B(); }
+class A {
+  const A();
+}
+
+class B extends A {
+  const B();
+}
 
 main() {
   var set1 = new Set<B>();
   set1.add(const B());
   var set2 = new Set<B>();
-  var list = <B>[ const B() ];
+  var list = <B>[const B()];
   var set3 = list.toSet();
 
   var sets = [set1, set2, set3];