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Previously, Assistant would auto-hide for any press event outside its
bounds or due to widget deactivation. Now, it will continue to do so
unless in mini state.

Bug: b:120291398
Change-Id: I06dff99094ad62782745d1f677f87744d4ad0307
Reviewed-on: https://chromium-review.googlesource.com/c/1357519
Commit-Queue: David Black <dmblack@google.com>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613337}