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This is consistent with the other Alt shortcuts for which we also
have Search shortcuts (Home, End, Bksp) and will aid in the possible
future deprecation/removal of the Alt shortcuts.

Bug: 1090186
Change-Id: Ifce1a066fb5bd5b27850625f759bbf815042147c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2227052
Auto-Submit: Peter Collingbourne <pcc@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Commit-Queue: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774403}