mtpd: migrate from base::MakeUnique to std::make_unique

base::MakeUnique is being deprecated as we can now use std::make_unique
when compiling code in the C++14 mode.

BUG=chromium:769107
CQ-DEPEND=CL:669672
TEST=Run unit tests.

Change-Id: I75c087898c0ae937de9c8af0bdee86362cdc8728
Reviewed-on: https://chromium-review.googlesource.com/691238
Commit-Ready: Ben Chan <[email protected]>
Tested-by: Ben Chan <[email protected]>
Reviewed-by: Lei Zhang <[email protected]>
Reviewed-by: Mike Frysinger <[email protected]>
1 file changed