Format all tests.

tests/language_strong/super_operator_index3_test.dart

Index: tests/language_strong/super_operator_index3_test.dart
diff --git a/tests/language_strong/super_operator_index3_test.dart b/tests/language_strong/super_operator_index3_test.dart
index f15330770ec2031fafc460e191cbeb1f44a7d06e..10edc0f0b9e0a2ec7f84acc6271b0bd83961dda3 100644
--- a/tests/language_strong/super_operator_index3_test.dart
+++ b/tests/language_strong/super_operator_index3_test.dart
@@ -8,11 +8,13 @@ import "package:expect/expect.dart";
 
 class A {
   var indexField = new List<int>(2);
-  operator[]=(index, value) { indexField[index] = value; }
+  operator []=(index, value) {
+    indexField[index] = value;
+  }
 }
 
 class B extends A {
-  operator[](index) => indexField[index];
+  operator [](index) => indexField[index];
 }
 
 class C extends B {