Get rid of a lot of () for getters.

tests/standalone/io/socket_invalid_arguments_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.
 
 #import("dart:io");
 
 class NotAnInteger {
   operator==(other) => other == 1;
   operator<(other) => other > 1;
   operator+(other) => 1;
 }
 
 class NotAList {
-  get length() => 10;
+  get length => 10;
   operator[](index) => 1;
 }
 
 testSocketCreation(host, port) {
   var s = new Socket(host, port);
   s.onError = (e) => null;
   s.onConnect = () => Expect.fail("Shouldn't get connected");
 }
 
 testReadList(buffer, offset, length) {
@@ skipping 37 matching lines @@
   testReadList([1, 2, 3], 1, new NotAnInteger());
   testWriteList(null, 123, 123);
   testWriteList(new NotAList(), 1, 1);
   testWriteList([1, 2, 3], new NotAnInteger(), new NotAnInteger());
   testWriteList([1, 2, 3], 1, new NotAnInteger());
   testWriteList([1, 2, 3], new NotAnInteger(), 1);
   testServerSocketCreation(123, 123, 123);
   testServerSocketCreation("string", null, null);
   testServerSocketCreation("string", 123, null);
 }