deadbeef a8bc1a1f63 Relanding: Use std::unique_ptr instead of rtc::scoped_refptr in AsyncInvoker.
The AsyncClosures only ever have one thing referencing them, so they
should be using std::unique_ptr to manage ownership. Maybe this code was
written before std::unique_ptr was available.

Originally reverted because it made a change to ScopedMessageData
that wasn't backwards compatible, and applications using the rtc::Thread
infrastructure may be using it.

BUG=None
NOTRY=True

Review-Url: https://codereview.webrtc.org/2689233003
Cr-Commit-Position: refs/heads/master@{#16684}
2017-02-18 02:06:26 +00:00
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