mtpd: replace scoped_ptr with std::unique_ptr

scoped_ptr from libchrome has been deprecated in favor of C++11
std::unique_ptr.

BUG=None
TEST=Run unit tests.

Change-Id: Ifaeecf3dca9d432d9e57b7473552902e90d8e91b
Reviewed-on: https://chromium-review.googlesource.com/416381
Commit-Ready: Ben Chan <benchan@chromium.org>
Tested-by: Ben Chan <benchan@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
1 file changed