Fix crash with page actions without icons

chrome/test/data/extensions/browsertest/crash_25562/script.js

Index: chrome/test/data/extensions/browsertest/crash_25562/script.js
===================================================================
--- chrome/test/data/extensions/browsertest/crash_25562/script.js	(revision 0)
+++ chrome/test/data/extensions/browsertest/crash_25562/script.js	(revision 0)
@@ -0,0 +1,7 @@
+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+if (window == top) {
+  chrome.extension.connect().postMessage(true);
+}