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Rename shortcut_manger to shortcut_manager

Change-Id: Ie21c942340b858f615f2dec84fe1b8821af00ff7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2208304
Commit-Queue: Eric Willigers <ericwilligers@chromium.org>
Reviewed-by: Eric Willigers <ericwilligers@chromium.org>
Cr-Commit-Position: refs/heads/master@{#770922}