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This CL removes command line switches for experimental features in AEC3
that now are deprecated.

This CL also replaces the outdated CL
(https://chromium-review.googlesource.com/c/chromium/src/+/1274905)

Bug: webrtc:8671
Change-Id: I83582049ab8c144ff8654107e928e8e75fd1f4e0
Reviewed-on: https://chromium-review.googlesource.com/c/1350752Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Per Åhgren <peah@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611029}