Format all tests.

tests/language_strong/super_operator_index4_test.dart

Index: tests/language_strong/super_operator_index4_test.dart
diff --git a/tests/language_strong/super_operator_index4_test.dart b/tests/language_strong/super_operator_index4_test.dart
index 4179a1f6392ed799204f86c43b402e7e3ff5abea..ea597349cf05bb2ec5fd259c3c0739460f877937 100644
--- a/tests/language_strong/super_operator_index4_test.dart
+++ b/tests/language_strong/super_operator_index4_test.dart
@@ -8,11 +8,13 @@ import "package:expect/expect.dart";
 
 class A {
   var indexField = new List<int>(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 {