Fix getters/setters unparsing, they appeared as ordinary methods without get/set keywords.

tests/compiler/dart2js/unparser_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:uri');
 #import('parser_helper.dart');
 #import("../../../lib/compiler/compiler.dart");
 #import("../../../lib/compiler/implementation/tree/tree.dart");
 
 testUnparse(String statement) {
@@ skipping 12 matching lines @@
 interface bool {}
 interface num {}
 interface int extends num {}
 interface double extends num {}
 interface String {}
 interface Function {}
 interface List {}
 interface Closure {}
 interface Dynamic {}
 interface Null {}
+assert() {}
 ''';
 
 testDart2Dart(String src, [void continuation(String s)]) {
   fileUri(path) => new Uri(scheme: 'file', path: path);
 
   final scriptUri = fileUri('script.dart');
 
   provider(uri) {
     if (uri == scriptUri) return new Future.immediate(src);
     if (uri.path.endsWith('/core.dart')) return new Future.immediate(coreLib);
@@ skipping 98 matching lines @@
 testClassWithMethod() {
   testDart2Dart('main(){var a=new A(); a.foo();}class A{void foo(){}}');
 }
 
 testVariableDefinitions() {
   testDart2Dart('main(){final var x, y; final String s;}');
   testDart2Dart('foo(f, g){}main(){foo(1, 2);}');
   testDart2Dart('foo(f(arg)){}main(){foo(main);}');
 }
 
+testGetSet() {
+  // Top-level get/set.
+  testDart2Dart('get foo(){return 5;}set foo(arg){}main(){foo; foo=5;}');
+  // Field get/set.
+  testDart2Dart('main(){var a=new A(); a.foo; a.foo=5;}class A{set foo(a){}get foo(){return 5;}}');
+}
+
 main() {
   testGenericTypes();
   testForLoop();
   testEmptyList();
   testClosure();
   testIndexedOperatorDecl();
   testNativeMethods();
   testPrefixIncrements();
   testConstModifier();
   testSimpleFileUnparse();
   testSimpleObjectInstantiation();
   testSimpleTopLevelClass();
   testClassWithSynthesizedConstructor();
   testClassWithMethod();
   testVariableDefinitions();
+  testGetSet();
   testTopLevelField();
 }