47183ba60b
With the current order of stop capture processing on Android, OnMemoryBufferFrame and OnTextureFrame may be called halfway through Stop(). They must therefore check for the case of a null capturer_. There used to be such checks, but they were accidantally removed in commit #12895, cl https://codereview.webrtc.org/1973873003. BUG=webrtc:5966 R=perkj@webrtc.org, sakal@webrtc.org Review URL: https://codereview.webrtc.org/2033943004 . Cr-Commit-Position: refs/heads/master@{#13031}