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The texts of the first step (launcher) of Welcome App should be
customized based on if voice interaction (Assistant) is enabled.

Bug: 750941
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I2d53c2e5c8e6e0d579f1564c7793d27fde96d172
Reviewed-on: https://chromium-review.googlesource.com/595111
Commit-Queue: Wenzhao (Colin) Zang <wzang@chromium.org>
Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491129}