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Historically, pressing CapsLock with an external keyboard on Chrome OS
generated F16 (XF86Launch7), in order to bypass limitation from the time
Chrome OS was still using X11. On Chrome side, F16 and CapsLock are
alerady treated as the same, and we can now remove handling of F16
completely.

XKB side change: https://crrev.com/c/1454437

TEST=manual (Confirmed an external keyboard CapsLock including remapping
keeps working with 1454437)
BUG=None

Change-Id: I99a18ffd99eec4b99a5e02031e52bd7693043f03
Reviewed-on: https://chromium-review.googlesource.com/c/1460215Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Kevin Schoedel <kpschoedel@chromium.org>
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#632062}