GitLab

Also leave splitview when Chromevox is turned on. It seems strange
to quit especially if user accidentally press Chromevox but also
strange if user can get into a unsupported state.

Test: manual
Bug: 853588
Change-Id: Iff9577462ec20d379ffce96d4998fcd64dffd321
Reviewed-on: https://chromium-review.googlesource.com/1111082Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569795}