Remove remaining references to scoped_ptr.

The last uprev of libchrome to r395517 missed some of the "scoped_ptr to
std::unique_ptr" changes done in http://crrev.com/386228.

BUG=chromium:672314
TEST=Trybot run on paladin and release builders.

Change-Id: Ieb0d6a59e0f122e63d4a986756f2764b5465018b
Reviewed-on: https://chromium-review.googlesource.com/419143
Commit-Ready: Ben Chan <benchan@chromium.org>
Tested-by: Ben Chan <benchan@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
5 files changed