GitLab

Moves some POSIX socket utilities into mojo/public/cpp/platform, moves
ConnectionParams into mojo/edk/system, deletes TransportProtocol.

Bug: 753541
Change-Id: I1575af268e89c0424e618f2a0974693f610f5969
Reviewed-on: https://chromium-review.googlesource.com/1109199
Commit-Queue: Ken Rockot <rockot@chromium.org>
Reviewed-by: Jay Civelli <jcivelli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569686}