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Rather than sending a `Sec-CH-UA` header containing the full version
number by default (e.g. "Chromium 99.0.1232.12"), send only the major
version (e.g. "Chromium 99").

This does not effect the value of `UserAgent.version` obtained from
`navigator.getUserAgent()`, but only the HTTP request header.

Bug: 928669
Change-Id: I074e244a3918b0bdab4453c2f56dc737c506f732
Reviewed-on: https://chromium-review.googlesource.com/c/1475438Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Commit-Queue: Mike West <mkwst@chromium.org>
Cr-Commit-Position: refs/heads/master@{#633726}