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This fixes a bug that caused accessibility voiceovers to be different
when navigating forwards vs backwards using the keyboard.

Bug: 1099806
Change-Id: I9cc6a2ec9a4dfdf84a41aaf731914e64e77acb04
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2303461Reviewed-by: Tommy Li <tommycli@chromium.org>
Commit-Queue: Angela Yoeurng <yoangela@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789619}