Revert of Modifies size of ring buffer in shared memory on the audio capture side (patchset #3 id:40001 of https://codereview.chromium.org/1254793002/ )
Revert of Modifies size of ring buffer in shared memory on the audio capture side (patchset #3 id:40001 of https://codereview.chromium.org/1254793002/ )

Reason for revert:
This was an speculative change and should now be reverted. There is no sign that this change would fix or improve the issue.

Original issue's description:
> Modifies size of ring buffer in shared memory on the audio capture side.
>
> We have seen reports in Chrome where segments of repeated input audio has
> damaged AEC performance in WebRTC clients. This patch is an attempt to limit
> the number of possible places in Chrome where such a patter could be created.
>
> It is a speculative patch and the idea is that it should live in Canary
> for a while so we can see if there are any positive effects.
>
> TBR=tommi
> BUG=b/13976602
> TEST=manual tests of different WebRTC clients running in loopback to ensure that no
> audio artifacts can be detected
>
> Committed: https://crrev.com/bda4fc7018c3ce93d88b74461a065f9eaf0b8b5f
> Cr-Commit-Position: refs/heads/master@{#340261}

TBR=tommi@chromium.org,dalecurtis@chromium.org,henrika@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=b/13976602

Review URL: https://codereview.chromium.org/1277173002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#342336}

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