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When the system tray bubble updates, we should notify accessibility
features too (namely switch access).

with ChromeVox.

Bug: 1105196
AX-Relnotes: N/A
Test: Manual; test that bug is fixed for switch access and still works
Change-Id: I5a48d43601502846de9b7acf934a02370d0b5c52
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2360558
Commit-Queue: Akihiro Ota <akihiroota@chromium.org>
Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799227}