Revert "Merge pull request #829 from symform/httpwebreq-async-ssl"

This reverts commit 35899c07fff7f7e4c6533364091bbac6ce86fdfd, reversing
changes made to 80166fd02fadc470e40b59df0c8c65c19945ed21.
[corlib] Mark awaited task exception observed when GetResult does the wait
added OSX travis branch