OnionSoup: Move keyboard_lock.mojom to public/mojom folder

This CL moves platform/modules/keyboard_lock to public/mojom/ to
gather mojom files to mojom folder and updates paths for
keyboard_lock.mojom.

Bug: 919393
Change-Id: Id982cefa71c09c4e6c5bdbd89463466fc4f663d7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1514274
Commit-Queue: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#639459}
8 files changed