[Background Sync] Remove use of new.

We now avoid using new in code. Use make_unique instead.

Change-Id: I354780cd9a368f8137f031a1682ee0a5f65c9422
Reviewed-on: https://chromium-review.googlesource.com/c/1466990
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Rayan Kanso <rayankans@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Commit-Queue: Mugdha Lakhani <nator@chromium.org>
Cr-Commit-Position: refs/heads/master@{#632580}
1 file changed