flags: remove gesture-typing

This flag (and the backing switch) are now not used.

Bug: None
Change-Id: I1858102174bcf792eaf4e85fbce16d81d34ce497
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1602735
Auto-Submit: Elly Fong-Jones <[email protected]>
Commit-Queue: Darren Shen <[email protected]>
Reviewed-by: Darren Shen <[email protected]>
Cr-Commit-Position: refs/heads/master@{#658310}
7 files changed