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Also, clear the tray icon when hiding previews (as this cancels any
pending update timers).

BUG=None

Change-Id: I9647ff70b3359bd803a434d39b64d3cd6f1186b0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2631193Reviewed-by: David Black <dmblack@google.com>
Commit-Queue: Toni Baržić <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843875}