GitLab

A small customization: in tablet mode, it doesn't make sense to display
a message related to a keyboard shortcut.

Bug: 887984
Change-Id: Ife9dbd11a0077b3c8001124b0224d50eac683b9c
Reviewed-on: https://chromium-review.googlesource.com/1242079Reviewed-by: Jacob Dufault <jdufault@chromium.org>
Commit-Queue: Wenzhao (Colin) Zang <wzang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594789}