Unwind the SSL connection holdback experiment and remove related code

net/socket/ssl_client_socket_nss.cc

Index: net/socket/ssl_client_socket_nss.cc
diff --git a/net/socket/ssl_client_socket_nss.cc b/net/socket/ssl_client_socket_nss.cc
index 9a8f72e5bc3bf7f78dbe01cf15ed3f21f465c0ce..78e936b2d453463b9d56d4cdfadd6dc0b7827eda 100644
--- a/net/socket/ssl_client_socket_nss.cc
+++ b/net/socket/ssl_client_socket_nss.cc
@@ -2925,21 +2925,6 @@ bool SSLClientSocketNSS::GetSSLInfo(SSLInfo* ssl_info) {
   return true;
 }
 
-std::string SSLClientSocketNSS::GetSessionCacheKey() const {
-  NOTIMPLEMENTED();
-  return std::string();
-}
-
-bool SSLClientSocketNSS::InSessionCache() const {
-  // For now, always return true so that SSLConnectJobs are never held back.
-  return true;
-}
-
-void SSLClientSocketNSS::SetHandshakeCompletionCallback(
-    const base::Closure& callback) {
-  NOTIMPLEMENTED();
-}
-
 void SSLClientSocketNSS::GetSSLCertRequestInfo(
     SSLCertRequestInfo* cert_request_info) {
   EnterFunction("");