Re-land "Format all multitests"

tests/language_strong/if_null_assignment_behavior_test.dart

Index: tests/language_strong/if_null_assignment_behavior_test.dart
diff --git a/tests/language_strong/if_null_assignment_behavior_test.dart b/tests/language_strong/if_null_assignment_behavior_test.dart
index 200d40fb4ff6b74fd3104ab9c4df2597be8311b9..42d65443ea8bd9cd40e8247fab3629c9908e60a4 100644
--- a/tests/language_strong/if_null_assignment_behavior_test.dart
+++ b/tests/language_strong/if_null_assignment_behavior_test.dart
@@ -110,14 +110,14 @@ class C {
 
   var indexGetValue = null;
 
-  operator[](index) {
+  operator [](index) {
     h.operations.add('$s[$index]');
     var tmp = indexGetValue;
     indexGetValue = null;
     return tmp;
   }
 
-  void operator[]=(index, value) {
+  void operator []=(index, value) {
     h.operations.add('$s[$index]=$value');
   }
 
@@ -153,7 +153,8 @@ class D extends C {
 main() {
   // Make sure the "none" test fails if "??=" is not implemented.  This makes
   // status files easier to maintain.
-  var _; _ ??= null;
+  var _;
+  _ ??= null;
 
   new C('c').instanceTest();
   new D('d').derivedInstanceTest();