Convert //third_party from scoped_ptr to std::unique_ptr

BUG=554298

Review URL: https://codereview.chromium.org/1911823002

Cr-Original-Commit-Position: refs/heads/master@{#389307}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 91cdd51340b8f6a0cc13ec9f5199defbea6cd49c
2 files changed