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Before this fix, assistive technologies (I tested with ChromeVox) were
unable to navigate into the IME candidates. For ChromeVox in particular,
using the arrow keys to navigate the candidates produced no speech
output.

With this fix, ChromeVox can navigate into the IME candidates and
speaks each candidate to the user.

Bug: 1034146
Change-Id: I77b584fc2a2648bc5f9fca479b2363d476628ac4
Relnotes: Make Chrome IME accessible to assistive technology.
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2151672Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Yuichiro Hanada <yhanada@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Akihiro Ota <akihiroota@chromium.org>
Cr-Commit-Position: refs/heads/master@{#760099}