zhihuang c63b894686 Modify the parameter type of PeerConnectionObserver callback OnAddTrack.
Change the second parameter type to a const reference of vector so that
the vector will not be copied.

BUG=none

Review-Url: https://codereview.webrtc.org/2551603003
Cr-Commit-Position: refs/heads/master@{#15396}
2016-12-02 23:41:15 +00:00
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