Format all tests.

tests/corelib_strong/set_containsAll_test.dart

Index: tests/corelib_strong/set_containsAll_test.dart
diff --git a/tests/corelib_strong/set_containsAll_test.dart b/tests/corelib_strong/set_containsAll_test.dart
index 9f6bae8d78d5d930c4a33901437f51f782765b3e..ccab046818e5fb97d9c53626babe923e480c551a 100644
--- a/tests/corelib_strong/set_containsAll_test.dart
+++ b/tests/corelib_strong/set_containsAll_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];