Enable connection pooling HttpNetworkTransactionTests on Windows.

These were disabled years back for hanging.  I've been unable to
reproduce the hang locally, but suspect it was an issue with the mock
socket data it used to use (OrderedSocketData).  It now uses
SequencedSocketData, which is much more robust.

BUG=124776

Review URL: https://codereview.chromium.org/1165773002

Cr-Commit-Position: refs/heads/master@{#332400}
1 file changed