GitLab

Changed to use std::unique_ptr in tests since scoped_ptr is being
removed.

Original patch: https://codereview.chromium.org/1877273002/
Revert: https://codereview.chromium.org/1916973003/

TBR=mfoltz@chromium.org

Review URL: https://codereview.chromium.org/1918403002

Cr-Commit-Position: refs/heads/master@{#389892}