Don't kill Chrome Apps that make XHRs from guests.

chrome/test/data/extensions/platform_apps/web_view/content_script_fetch/test.js

Index: chrome/test/data/extensions/platform_apps/web_view/content_script_fetch/test.js
diff --git a/chrome/test/data/extensions/platform_apps/web_view/content_script_fetch/test.js b/chrome/test/data/extensions/platform_apps/web_view/content_script_fetch/test.js
new file mode 100644
index 0000000000000000000000000000000000000000..048d1b5c1939d4d95d38314f16565ddbfaea0e45
--- /dev/null
+++ b/chrome/test/data/extensions/platform_apps/web_view/content_script_fetch/test.js
@@ -0,0 +1,7 @@
+// Copyright 2017 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.app.runtime.onLaunched.addListener(function() {
+  chrome.app.window.create('embedder.html', {}, function () {});
+});