Migrate //content/browser/browsing_data to net::CompletionOnceCallback

Replace usage of net::CompletionCallback as well as replace usages of
base::Bind() with base::BindOnce().

Bug: 807724
Change-Id: I0ac05f1f0b82cd2e800710691fd7f3e4ccdbccb8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1532013
Reviewed-by: Bence Béky <bnc@chromium.org>
Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Commit-Queue: Mario Sanchez Prada <mario@igalia.com>
Cr-Commit-Position: refs/heads/master@{#643303}
5 files changed