Store handoff test

Open this page in the Facebook in-app browser. Tap one case, note whether you get the App Store card, the "Page not found" screen, or both. Then reopen this page for the next case.

1. tap -> https
https://apps.apple.com/app/id1125517808?mt=8 2. tap -> itms-apps
itms-apps://apps.apple.com/app/id1125517808?mt=8 3. auto on load -> https
window.location.href = https://... (current production) 4. auto on load -> itms-apps
window.location.href = itms-apps://... (proposed fix) 5. auto after 1.5s -> itms-apps
setTimeout(..., 1500) (does a rendered page survive?)