Remove workaround for *.clients.google.com hostname verication.

This removes the workaround for TLS/SSL server certificate presented
by android.clients.google.com without Server Name Indication (SNI)
not matching android.clients.google.com
(8576f309825e23add080f2a50345ec1884939c39). This type of
service/provider-specific workaround does not belong into the core
library. Applications relying on this workaround will now need to use
SNI or a custom HostnameVerifier.

This is a cherry-pick of upstream commit
https://github.com/square/okhttp/commit/9549fb4455f54d96a307ce17d280ff55df855470

Bug: 5426333

Change-Id: Iec822ad7395f4bc16323c0b82650d688ab7b299f