Format all tests.

tests/corelib_strong/list_index_of2_test.dart

Index: tests/corelib_strong/list_index_of2_test.dart
diff --git a/tests/corelib_strong/list_index_of2_test.dart b/tests/corelib_strong/list_index_of2_test.dart
index 56aec924faeaf25e4c2579228c4f56964e5121a6..abd89a58a35ab6b899f9fe49a70f7892f4284c1f 100644
--- a/tests/corelib_strong/list_index_of2_test.dart
+++ b/tests/corelib_strong/list_index_of2_test.dart
@@ -4,8 +4,13 @@
 
 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();
+}
 
 void test(List<B> list) {
   // Test that the list accepts a different type for indexOf.