Remove workaround for *.clients.google.com.

This removes the workaround for broken TLS/SSL server certificates
that were being presented by android.clients.google.com in early 2012
(8576f309825e23add080f2a50345ec1884939c39). The server is presenting
better certificates these days and the workaround is no longer needed.

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

Bug: 5426333

(cherry picked from commit 66acc679)

Change-Id: I3a0cee90391e786f5e469ed3af0b9e4d4aa02307