Fix crash when incognito split mode extension using the WebRequest API was reloaded

chrome/test/data/extensions/api_test/webrequest_reload/background.js

Index: chrome/test/data/extensions/api_test/webrequest_reload/background.js
diff --git a/chrome/test/data/extensions/api_test/webrequest_reload/background.js b/chrome/test/data/extensions/api_test/webrequest_reload/background.js
new file mode 100644
index 0000000000000000000000000000000000000000..e8e55f401cd2a404c4492b3bb4862b48fe43bd71
--- /dev/null
+++ b/chrome/test/data/extensions/api_test/webrequest_reload/background.js
@@ -0,0 +1,16 @@
+// Copyright (c) 2013 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.
+
+chrome.webRequest.onBeforeRequest.addListener(
+  function(details) {
+  },
+  {
+    urls: [],
+    types: []
+  },
+  []);
+if (chrome.extension.inIncognitoContext)
+  chrome.test.sendMessage("done_incognito");
+else
+  chrome.test.sendMessage("done");