The new class wraps any CoreFoundation Type ref and
automatically releases it when it goes out of scope.
Conceptually similar to std::unique_ptr.
Bug: webrtc:7825
Change-Id: Ie49572b9215fcb5b92b2c0c3e3d52b0b3cf01752
Reviewed-on: https://webrtc-review.googlesource.com/3380
Commit-Queue: Kári Helgason <kthelgason@webrtc.org>
Reviewed-by: Magnus Jedvert <magjed@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20045}
a17ddcdecf