Reason for revert:
Memcheck buildbot detected memory leaks in the death tests. The code looks fine to me, but please investigate what causes the error and reland.
Original issue's description:
> Added first layer of the echo canceller 3 functionality.
>
> This CL adds the first layer of the echo canceller 3.
> All of the code is as it should, apart from
> block_processor.* which only contains placeholder
> functionality. (Upcoming CLs will add proper
> functionality into those files.)
>
>
>
> BUG=webrtc:6018
>
> Review-Url: https://codereview.webrtc.org/2584493002
> Cr-Commit-Position: refs/heads/master@{#15861}
> Committed: 38fd1758e9TBR=ivoc@webrtc.org,aleloi@webrtc.org,henrik.lundin@webrtc.org,peah@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:6018
Review-Url: https://codereview.webrtc.org/2603293002
Cr-Commit-Position: refs/heads/master@{#15877}
7946b546db