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Also other misc. cleanup, e.g. use make_unique more.

Bug: 82078
Change-Id: Ibe4384e74b905d4fc60392edf258663ddc6bc5a2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1844339
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Auto-Submit: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703234}