Revert "Add QWAVE/DSCP support for unconnected sockets.  Create a helper class for maintaining remote addresses that have been configured for dscp.  Adapted from cl 682456."

This reverts commit 86cf2b472f51547ab2ded2a843740bddc70ad15c.

Reason for revert: Likely causing build flakiness: https://bugs.chromium.org/p/chromium/issues/detail?id=890293#c2

Original change's description:
> Add QWAVE/DSCP support for unconnected sockets.  Create a helper class for maintaining remote addresses that have been configured for dscp.  Adapted from cl 682456.
> 
> Bug: webrtc:5836
> Change-Id: I2ded915e82a7e967962ff3b1f4027b422d055157
> Reviewed-on: https://chromium-review.googlesource.com/1191925
> Commit-Queue: Tim Haloun <thaloun@chromium.org>
> Reviewed-by: Ryan Hamilton <rch@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#594931}

TBR=pauljensen@chromium.org,rch@chromium.org,thaloun@chromium.org

Change-Id: If2502da611962557ecf4eb4da2760860a3c9540a
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: webrtc:5836
Reviewed-on: https://chromium-review.googlesource.com/1252529
Reviewed-by: François Doray <fdoray@chromium.org>
Commit-Queue: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595207}
3 files changed