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This CL does the following things:
(1) Note that a clipboard history menu item is removed asynchronously.
This CL ensures that only the menu item finally selected is announced.

(2) This CL also changes the a11y announcement when a manu item is
removed.

Bug: 1150503
Change-Id: I0ea16ff1b93cdb3a749833c2e0b08a3616e79108
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2513749Reviewed-by: David Black <dmblack@google.com>
Commit-Queue: Andrew Xu <andrewxu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835350}