Get rid of a lot of () for getters.

tests/compiler/dart2js/patch_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("../../../lib/compiler/implementation/leg.dart");
 #import("../../../lib/compiler/implementation/elements/elements.dart");
 #import("../../../lib/compiler/implementation/tree/tree.dart");
 #import("../../../lib/compiler/implementation/util/util.dart");
 #import("mock_compiler.dart");
 #import("parser_helper.dart");
@@ skipping 55 matching lines @@
       """);
   var container = ensure(compiler, "Class", compiler.coreLibrary.find);
   container.parseNode(compiler);
   ensure(compiler, "toString", container.lookupLocalMember, hasBody:true);
 }
 
 testPatchGetter() {
   var compiler = applyPatch(
       """
       class Class {
-        external int get field();
+        external int get field;
       }
       """,
       """
       patch class Class {
-        patch int get field() => 5;
+        patch int get field => 5;
       }
       """);
   var container = ensure(compiler, "Class", compiler.coreLibrary.find);
   container.parseNode(compiler);
   ensure(compiler,
          "field",
          container.lookupLocalMember,
          isGetter: true,
          hasBody: true);
 }
 
 testInjectFunction() {
   var compiler = applyPatch(
       "",
       "int _function() => 5;");
   ensure(compiler,
          "_function",
          compiler.coreLibrary.find,
          hasBody: true,
          isPatched: false);
 }
 
 main() {
   testPatchFunction();
   testPatchMember();
   testPatchGetter();
   testInjectFunction();
 }