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Previously we hid Assistant on widget deactivation. Then we removed
that logic to instead use an event handler that dismissed Assistant on
press.

We actually need both since Assistant widget can be deactivated w/o a
press event, such as happens when opening feedback via Alt+Shift+i.

Bug: b:117990949
Change-Id: I75338ef112f5cef3445bf88903adaef2ccd56c48
Reviewed-on: https://chromium-review.googlesource.com/c/1292604Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Commit-Queue: David Black <dmblack@google.com>
Cr-Commit-Position: refs/heads/master@{#601372}