Reason for revert:
The bug number for the chromium bug was wrong.
Original issue's description:
> Added ARM Neon optimizations for AEC3
>
> This CL adds Neon SIMD optimizations for AEC3 on ARM, resulting
> in an 8 times complexity reduction. The optimizations are basically
> identical to what was already in place for SSE2.
>
> BUG=chromium:14993, webrtc:6018
>
> Review-Url: https://codereview.webrtc.org/2834073005
> Cr-Commit-Position: refs/heads/master@{#17993}
> Committed: f246b91ebaTBR=ivoc@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:14993, webrtc:6018
Review-Url: https://codereview.webrtc.org/2856113003
Cr-Commit-Position: refs/heads/master@{#17994}
b70f8cfd4d