Format all tests.

tests/language/super_operator_index4_test.dart

Index: tests/language/super_operator_index4_test.dart
diff --git a/tests/language/super_operator_index4_test.dart b/tests/language/super_operator_index4_test.dart
index 8a82959f55887277ddc6d6258191fe2bb831d1f9..3530310cb915a2fdd9cd74c27648886857df8e26 100644
--- a/tests/language/super_operator_index4_test.dart
+++ b/tests/language/super_operator_index4_test.dart
@@ -8,11 +8,13 @@ import "package:expect/expect.dart";
 
 class A {
   var indexField = new List(2);
-  operator[](index) => indexField[index];
+  operator [](index) => indexField[index];
 }
 
 class B extends A {
-  operator[]=(index, value) { indexField[index] = value; }
+  operator []=(index, value) {
+    indexField[index] = value;
+  }
 }
 
 class C extends B {