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Acquiring stream_lock_ in WebRtcVideoChannel2 in a callback from Call forms a lock-order inversion between process-thread locks and libjingle locks, manifesting as CPU adaptation requests blocking on stream creation that is blocked on the CPU adaptation request finishing. R=asapersson@webrtc.org, mflodman@webrtc.org BUG=4535,chromium:475065 Review URL: https://webrtc-codereview.appspot.com/50679004 Cr-Commit-Position: refs/heads/master@{#8985}