Get rid of a lot of () for getters.

tests/language/field6a_negative_test.dart

 // Copyright (c) 2011, 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 to catch error reporting bugs in class fields declarations.
 // Should be an error because we have a function overriding a getter.
 
 class A {
-  int get a() {
+  int get a {
     return 10;
   }
   int a() {
     return 1;
   }
 }
 
 class Field6aNegativeTest {
   static testMain() {
   }
 }
 
 main() {
   Field6aNegativeTest.testMain();
 }