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base::Callback has been deprecated in favor of base::OnceCallback and
base::RepeatingCallback. In the case of SysLogsSourceCallback it turns
out that it is sufficient to always use base::OnceCallback.
For this reason, all base::Bind calls are replaced with base::BindOnce.
As base::OnceCallback does not have a copy-constructor to protect the
single-call semantics, the value is std::move()ed in a couple of places.
This also means that callbacks need to be passed by value instead
of const-reference. See docs/callback.md for more details.

TBR=rdevlin.cronin@chromium.org

Bug: 787554, 714018
Change-Id: I557c4600b2d927d74345dceb6946b82b711c1cbc
Reviewed-on: https://chromium-review.googlesource.com/808706
Commit-Queue: Dominic Battré <battre@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Simon Que <sque@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523848}