Taylor Brandstetter 215fda713e Make PeerConnection take reference to UMA observer.
It's reference counted, yet we aren't taking a reference to it for some
reason. This could be causing it to be dereferenced after deletion in
some cases in chromium.

Bug: chromium:798251
Change-Id: I0b91451e38ed611d2ea8a477f1e7db482a790f79
Reviewed-on: https://webrtc-review.googlesource.com/37283
Reviewed-by: Peter Thatcher <pthatcher@webrtc.org>
Commit-Queue: Taylor Brandstetter <deadbeef@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21684}
2018-01-18 20:07:58 +00:00
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