Don't return Java7ExtendedSSLSession on Android. (#391)
Don't return Java7ExtendedSSLSession on Android. (#391)

It turns out that ExtendedSSLSession wasn't available until API 24, so
the only API levels that support ExtendedSSLSession also support Java
8.
google/conscrypt,google/conscrypt,google/conscrypt,google/conscrypt,google/conscrypt,google/conscrypt