Remove ssl_version hook.

It's never called or implemented.

Change-Id: Id41c2fbd23d27cc440e8a23ac1b2d590e50ff20f
Reviewed-on: https://boringssl-review.googlesource.com/3770
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/ssl/d1_meth.c b/ssl/d1_meth.c
index 34a2098..84f56c9 100644
--- a/ssl/d1_meth.c
+++ b/ssl/d1_meth.c
@@ -78,7 +78,6 @@
   ssl3_pending,
   ssl3_num_ciphers,
   dtls1_get_cipher,
-  ssl_undefined_void_function,
   ssl3_callback_ctrl,
   ssl3_ctx_callback_ctrl,
   DTLS1_HM_HEADER_LENGTH,
diff --git a/ssl/s3_meth.c b/ssl/s3_meth.c
index f8375a1..a557b32 100644
--- a/ssl/s3_meth.c
+++ b/ssl/s3_meth.c
@@ -77,7 +77,6 @@
     ssl3_pending,
     ssl3_num_ciphers,
     ssl3_get_cipher,
-    ssl_undefined_void_function,
     ssl3_callback_ctrl,
     ssl3_ctx_callback_ctrl,
     SSL3_HM_HEADER_LENGTH,
diff --git a/ssl/ssl_locl.h b/ssl/ssl_locl.h
index 59180f6..fdf292a 100644
--- a/ssl/ssl_locl.h
+++ b/ssl/ssl_locl.h
@@ -556,7 +556,6 @@
   int (*ssl_pending)(const SSL *s);
   int (*num_ciphers)(void);
   const SSL_CIPHER *(*get_cipher)(unsigned ncipher);
-  int (*ssl_version)(void);
   long (*ssl_callback_ctrl)(SSL *s, int cb_id, void (*fp)(void));
   long (*ssl_ctx_callback_ctrl)(SSL_CTX *s, int cb_id, void (*fp)(void));
   /* Handshake header length */