Re: [manifest] Won't related_application be needed at page load? (#364)

I don't think this needs to happen synchronously in the page load process. Chrome is happy to fetch the manifest asynchronously and prompt the user whenever the data comes back. Since we _also_ enforce an engagement check (i.e., you never, ever see the prompt the first time you visit), the async nature isn't a problem for us. Strongly suggest that other vendors consider doing the same, if only to avoid browser UI being used in a spammy way.

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