RtcEventLogOutputFile needs to reset file_ whenever the file is not successfully opened. (The destructor DCHECKs that file_ only exists if it's active, so as to help maintain this.) Bug: webrtc:8111 Change-Id: I9a375a142af821b3c7183032f0b5d4d612dfa6b8 Reviewed-on: https://webrtc-review.googlesource.com/8080 Commit-Queue: Elad Alon <eladalon@webrtc.org> Reviewed-by: Björn Terelius <terelius@webrtc.org> Cr-Commit-Position: refs/heads/master@{#20229}