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This results in more intuitive behavior of Chrome with respect to tab switching
shortcuts.

Bug: 889424
Change-Id: I1ccba5141a3ddbfd2391d2d40e0d5884b50a382f
Reviewed-on: https://chromium-review.googlesource.com/1259244Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596288}