eladalon 8ec568a9ff Make CreateRtcLogStreamConfig() return a std::unique_ptr
This is done for two reasons:
1. This will be useful in an upcoming CL, when all logging will be done with one function that accepts a std::unique_ptr<RtcEvent>.
2. Ensure no unnecessary copies when the compiler fails to optimize.

BUG=webrtc:8111
TBR=stefan@webrtc.org

Review-Url: https://codereview.webrtc.org/3010273002
Cr-Commit-Position: refs/heads/master@{#19746}
2017-09-08 13:15:52 +00:00
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