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Navigation icons should be mirrored (resume, prev/next sentence/paragraph). Also left/right keyboard shortcuts should be reversed for sentence navigation.

Bug: 1168802
Change-Id: I03e54c5e98fb086cc86c2a8bd06455f35631a6e3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2640927
Commit-Queue: Joel Riley <joelriley@google.com>
Reviewed-by: Katie Dektar <katie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845812}