Bugfixes for multicast support on Fuchsia.

- Updated UDPSocketPosix to pass correct arguments when joining/leaving
  multicast groups.
- Enabled unittests.

Bug: 768916
Change-Id: I96a8170cad3c52b8cf922cac86e13c2bc4f97021
Reviewed-on: https://chromium-review.googlesource.com/729538
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Eric Roman <eroman@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#510905}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 20007f6c4846bd8b37cc54001fbcbba0e4556d22
3 files changed