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Currently, Switch Access looks for the menu panel each time it needs it.
Instead, we expect the node to be in the accessibility tree once its
javascript has loaded.

Bug: None
Change-Id: Ic48a3110c1c9ce40ab6581bf78c782b3f2a9d17e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1841503Reviewed-by: Akihiro Ota <akihiroota@chromium.org>
Commit-Queue: Anastasia Helfinstein <anastasi@google.com>
Cr-Commit-Position: refs/heads/master@{#703513}