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NOTIFICATION_BOOKMARK_CONTEXT_MENU_SHOWN is used to schedule a callback
right before the bookmark context menu is run. This is used only in
interactive tests.  Instead of using this notification, use a more
explicit API to register callbacks to run before running the context
menu.

BUG=268984

Change-Id: I43c78118d6fd7ef53f0b7e7c70aefc85670cf78b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1831275
Commit-Queue: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701434}