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This calls the modern UnmountEx method in cryptohome instead of the
deprecated Unmount method.

Bug: 811551
Change-Id: I262b3b29eaf2dba969c95f9d0a7cfc70468f4f19
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1464453Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Reviewed-by: Dan Erat <derat@chromium.org>
Commit-Queue: Greg Kerr <kerrnel@chromium.org>
Auto-Submit: Greg Kerr <kerrnel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638370}