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Include "fallback" languages in the "sec-ch-lang" and "accept-language"
headers rather than relying on generic language fallbacks. This allows
language/locale combinations that are less commonly supported by sites
to be substituted with more appropriate commonly-supported combinations
than would otherwise be possible.

Bug: 1092804, 1164990
Change-Id: I7827ecbc24c0d2745e53a7c50af01b2c0cda0773
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2632757
Auto-Submit: Wez <wez@chromium.org>
Commit-Queue: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: David Dorwin <ddorwin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844834}