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This CL ensures that the multipaste menu's selection behavior follows
the specs:
(1) When the menu item is selected as default or by the arrow key,
the menu item's delete button should not show.
(2) When the menu item is selected by mouse hovering, the menu item's
delete button should show.

Bug: 1134422
Change-Id: I4553077aa343cd5f740035e85f9dc1cef538f6f5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2446459Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: David Black <dmblack@google.com>
Commit-Queue: Andrew Xu <andrewxu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814761}