Revert "[Fuchsia] Filter tests broken by getsockname()."

This reverts commit b163621e.

Reason for revert: These tests no longer fail under Fuchsia.

Original change's description:
> [Fuchsia] Filter tests broken by getsockname().
>
> Temporarily filter some tests which fail due to broken getsockname()
> semantics on connect()ed UDP sockets.
>
> Bug: 989223
> Change-Id: I5ddd5783d33ce84999cced12f273d3680f56fae1
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1730653
> Auto-Submit: Wez <wez@chromium.org>
> Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
> Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#683366}

Bug: 989223
Change-Id: I6c15a468c80ccceafe3c198cc333f0487a52404b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2144175
Auto-Submit: Wez <wez@chromium.org>
Reviewed-by: David Dorwin <ddorwin@chromium.org>
Commit-Queue: David Dorwin <ddorwin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758219}

testing/buildbot/filters/fuchsia.services_unittests.filter

@@ -29,8 +29,3 @@
 
 # https://crbug.com/986544 - Flakes with mismatched state expectations.
 -URLLoaderTest.ResourceSchedulerIntegration
-
-# https://crbug.com/989223 - connect()ed UDP socket's getsockname() is wrong.
--UDPSocketTest.TestReceiveMoreWithBufferSize
--UDPSocketTest.TestReadSend
--NetworkContextTest.CreateUDPSocket