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The account check can complete after startup completes, which leaves
the ui components out of sync with each other and the current assistant
capabilities. Adding an observer to GSAState to monitor for account
changes and updating AssistantVoiceSearchService clients accordingly.

Bug: 1163196
Change-Id: I02c17425458544cf5afaa9fdd434f661061b0014
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2611655Reviewed-by: Peter Conn <peconn@chromium.org>
Reviewed-by: Nick Burris <nburris@chromium.org>
Reviewed-by: Filip Gorski <fgorski@chromium.org>
Commit-Queue: Brandon Wylie <wylieb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841540}