Add UnmountPath endpoint to the SdkService.

Ran ./generate.sh in chromiumos/chromite/infra/proto.

BUG=chromium:1095661
TEST=generate.sh

Change-Id: Id3ccc6f0af8d962b30929221a83dfba3584011af
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2319852
Reviewed-by: Alex Klein <saklein@chromium.org>
Commit-Queue: Michael Mortensen <mmortensen@google.com>
Tested-by: Michael Mortensen <mmortensen@google.com>
2 files changed