Reason for revert:
Creating revert to fix these tests.
Original issue's description:
> Disable SeqNumUnwrapper death tests to avoid breaking downstream builds.
>
> BUG=None
> TBR=stefan@webrtc.org
> NOTRY=true
>
> Review-Url: https://codereview.webrtc.org/2985083002
> Cr-Commit-Position: refs/heads/master@{#19155}
> Committed: 8e245561f2
TBR=stefan@webrtc.org
BUG=None
Review-Url: https://codereview.webrtc.org/2992643002
Cr-Commit-Position: refs/heads/master@{#19166}
Name: WebRTC URL: http://www.webrtc.org Version: 90 License: BSD License File: LICENSE Description: WebRTC provides real time voice and video processing functionality to enable the implementation of PeerConnection/MediaStream. Third party code used in this project is described in the file LICENSE_THIRD_PARTY.