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Added a new Delete action to History entries' context menus. Selecting
that action will delete the focused entry.

Regarding the business logic of the action (deleting the entry), this CL
reuses the existing delete logic used by entries' accessibility actions.

Bug: 1093302
Change-Id: Id1a21fe441ee922d63e10107e9bdbaadadc7be75
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2308849Reviewed-by: Mark Cogan <marq@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Sebastien Lalancette <seblalancette@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792672}