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This CL fixes an issue where the right-click of a bookmark item wouldn't show a
new command menu when a command menu was already open. This was caused by the
mousedown on the original menu not closing the menu.

When cr-action-menu changed to no longer be a type extension, the event was no
longer fired by the dropdown itself, and rather a child. This CL changes the
event expectation so that the menu will close correctly.

Bug: 825119
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I1cd5494c7208b21d55f817303389bb845794458e
Reviewed-on: https://chromium-review.googlesource.com/1013769
Commit-Queue: calamity <calamity@chromium.org>
Reviewed-by: Alan Cutter <alancutter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551615}