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MountPoint uses a simple callback for result, instead of having to
register an observer and waiting for the appropriate event. The strong
ownership semantics of MountPoint also mean that explicit unmount are no
longer necessary.

Bug: 939235
Change-Id: I8478e414b8b7cc1c462985f272dea108547f67c5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2006895Reviewed-by: Sergei Datsenko <dats@chromium.org>
Commit-Queue: Anand Mistry <amistry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#733489}