Get rid of a lot of () for getters.

tests/language/override_field_method2_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 error for overriding getter with method.
 
 class A {
-  get foo() { return 123; }
+  get foo { return 123; }
 }
 
 class B extends A {
   foo() {}  // method cannot override getter.
 }
 
 class OverrideFieldMethod2NegativeTest {
   static testMain() {
     new B().foo();
   }
 }
 
 main() {
   OverrideFieldMethod2NegativeTest.testMain();
 }