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No behavioral differences: these appear to be old occurrences that
predate the broad adoption of std::unique_ptr in the codebase.

Change-Id: I28ff0e7ac91c8545b3b3cea748ba0681366b48a9
Bug: None
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2556943
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Victor Vianna <victorvianna@google.com>
Auto-Submit: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830725}