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Was previously defaulted to voice input modality.
Later there will be a user preference that we defer to.

Bug: b:110174827
Change-Id: I1a0eac49f76a53145589c0095df82b4a2d673d03
Reviewed-on: https://chromium-review.googlesource.com/1100300Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Commit-Queue: David Black <dmblack@google.com>
Cr-Commit-Position: refs/heads/master@{#567463}