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This reverts commit f35977d9.

Reason for revert: causes TCPSocketTest.ReadAndWriteMultiple to flake (timeout)

Bug: 821232

Original change's description:
> Add TCP socket API to network service
> 
> This CL adds TCP socket API to network service.
> This is partly based on mandoline implementation
> (https://codereview.chromium.org/1873463003/)
> 
> Two TCP socket interfaces are added.
> - TCPConnectedSocket
> - TCPServerSocket
> 
> TBR=miu@chromium.org
> 
> Bug: 721401
> Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
> Change-Id: I56e2702c02b9c86a72eba68c85391c3b017a4d64
> Reviewed-on: https://chromium-review.googlesource.com/868711
> Reviewed-by: Helen Li <xunjieli@chromium.org>
> Reviewed-by: Matt Menke <mmenke@chromium.org>
> Reviewed-by: Tom Sepez <tsepez@chromium.org>
> Reviewed-by: Ramin Halavati <rhalavati@chromium.org>
> Commit-Queue: Helen Li <xunjieli@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#542606}

TBR=miu@chromium.org,mmenke@chromium.org,tsepez@chromium.org,xunjieli@chromium.org,rhalavati@chromium.org

Change-Id: Id31caa2f5cc54993735586555e68bd3c345600bb
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 721401
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
Reviewed-on: https://chromium-review.googlesource.com/958943Reviewed-by: Trent Apted <tapted@chromium.org>
Commit-Queue: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542696}