Better mangling in frog for fixing parts of issue 1837.

client/tests/client/dom/WindowManglingTest.dart

Index: client/tests/client/dom/WindowManglingTest.dart
===================================================================
--- client/tests/client/dom/WindowManglingTest.dart	(revision 0)
+++ client/tests/client/dom/WindowManglingTest.dart	(revision 0)
@@ -0,0 +1,33 @@
+// 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.
+
+#library('WindowManglingTest');
+#import('../../../testing/unittest/unittest.dart');
+#import('dart:dom', prefix: 'dom');
+
+// Defined in dom.Window.
+get navigator() => "Dummy";
+
+$eq(x, y) => false;
+$eq$(x, y) => false;
+
+main() {
+  var win = dom.window;
+
+  test('windowMethod', () {
+      final message = navigator;
+      final x = win.navigator;
+      Expect.notEquals(message, x);
+    });
+
+  test('windowEquals', () {
+      Expect.isFalse($eq(win, win));
+      Expect.isTrue(win == win);
+    });
+
+  test('windowEquals', () {
+      Expect.isFalse($eq$(win, win));
+      Expect.isTrue(win == win);
+    });
+}