cbe408aa11
This avoids a deadlock in WebRtcVideoCapturer. The deadlock could occur because OnIncomingFrame() has the |critical_section_stopping_| lock, which could block a Stop() on the |start_thread_|. When OnIncomingFrame() then tries to do synchronous invoke on |start_thread_| (before releasing said lock) we have a deadlock. BUG=4670 R=magjed@webrtc.org, tommi@webrtc.org Review URL: https://webrtc-codereview.appspot.com/47259004 Cr-Commit-Position: refs/heads/master@{#9294}