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CTRL+RIGHT with keyboard focus on a tab will now always move the current
tab right, and CTRL+LEFT will move it left. Likewise, CTRL+SHIFT+RIGHT
will always move the current tab to the right end of the tabstrip, and
CTRL+SHIFT+LEFT will move to the left end.

Prelude to fixing the attached bug.

Bug: 1110426
Change-Id: Ib29d539db982b9b970ea192ca9edb13b18ca7d0a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2528179Reviewed-by: Charlene Yan <cyan@chromium.org>
Commit-Queue: Dana Fried <dfried@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826112}