Format all tests.

tests/language_strong/conditional_access_helper.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // Library used by conditional_property_assignment_test.dart,
 // conditional_property_access_test.dart, and
 // conditional_method_invocation_test.dart, all of which import it using the
 // prefix "h.".
 
 library lib;
 
 var topLevelVar;
 
 void topLevelFunction() {}
 
 class C {
   static int staticInt;
   static staticF(callback()) => callback();
   static int staticG(int callback()) => callback();
 }
 
 C nullC() => null;
 
 class D {
   static E staticE;
 }
 
 class E {
-  G operator+(int i) => new I();
-  G operator-(int i) => new I();
+  G operator +(int i) => new I();
+  G operator -(int i) => new I();
 }
 
 class F {}
 
 class G extends E implements F {}
 
 class H {}
 
 class I extends G implements H {}