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Right now sessions data on disk are never deleted. Instead delete them
whenever the app receives a signal that this session can no longer be
brought back via "didDiscardSceneSessions" appdelegate.

This is done by adding a new method to BrowsingDataCommands protocol
and allowing the mainController to conform to it.

Bug: 1114847
Change-Id: I767f75c996fa8554943c09f84c9c637851beee32
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2347248
Commit-Queue: Mohammad Refaat <mrefaat@chromium.org>
Reviewed-by: edchin <edchin@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797908}