Disable AcceptEx on Win32 Apache

Some layout tests time out since the switch to apache server, with
AcceptEx failures logged on error log. This may fix the issue.

BUG=30536, 431172

Review URL: https://codereview.chromium.org/695193006

git-svn-id: svn://svn.chromium.org/blink/trunk@185174 bbb929c8-8fbe-4397-9dbb-9b2b20218538