Update language tests to new getter syntax.

dart/tests/language/top_level_prefixed_declaration_test.dart

 // Copyright (c) 2012, 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.
 //
 // Dart test for top level declarations involving an imported type.
 
 #library("main");
 #import("library11.dart", prefix : "lib11");
 
 lib11.Library11 variable = null;
 
 lib11.Library11 function() => null;
 
-lib11.Library11 get getter() => null;
+lib11.Library11 get getter => null;
 
 main() {
   Expect.isTrue(variable == null);
   Expect.isTrue(function() == null);
   Expect.isTrue(getter == null);
 }