For modern bundles, treat Chromium and "Headless Chrome" the same as Chrome.
For modern bundles, treat Chromium and "Headless Chrome" the same as Chrome.

Best I can tell, the major version portion of Chromium versions has always
tracked all the way through to Chrome Canary, Dev and Stable releases.
Since we observe the major version of Chrome in terms of identifying it as a
"modern browser", it seems to make sense to treat "Headless Chrome" and
Chromium in the same regard.

Interestingly, when the same Chrome as we all use on our machines is run
with the `--headless` flag, it switches its `navigator.userAgent` to
`HeadlessChrome/`, rather than `Chrome/`.

This was initially problematic since the `useragent` npm we use for parsing
user agents didn't understand this designation, however, with the update of
`webapp`'s `useragent` npm in 058351b7, `headlesschrome` will now have its
version available from `WebAppInternals.identifyBrowser`, so we can
accurately identify it and serve it the modern bundle.

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