Convert //tools to use std::unique_ptr

BUG=554298

Review URL: https://codereview.chromium.org/1869503004

Cr-Original-Commit-Position: refs/heads/master@{#386168}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: a500b69aa06c2bc084a3b1867b9824f4218014de
48 files changed
tree: fa915534c38d0393bbf3cc3f9a2ccbd46976c346
  1. tools/