Don't make SSL_MODE_*HELLO_TIME configurable.

Never send the time as a client. Always send it as a server.

Change-Id: I20c55078cfe199d53dc002f6ee5dd57060b086d5
Reviewed-on: https://boringssl-review.googlesource.com/4829
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/ssl/internal.h b/ssl/internal.h
index 0c0ecc3..4ca36f3 100644
--- a/ssl/internal.h
+++ b/ssl/internal.h
@@ -855,7 +855,10 @@
 
 STACK_OF(SSL_CIPHER) *ssl_get_ciphers_by_id(SSL *s);
 int ssl_verify_alarm_type(long type);
-int ssl_fill_hello_random(SSL *s, int server, uint8_t *field, size_t len);
+
+/* ssl_fill_hello_random fills a client_random or server_random field of length
+ * |len|. It returns one on success and zero on failure. */
+int ssl_fill_hello_random(uint8_t *out, size_t len, int is_server);
 
 const SSL_CIPHER *ssl3_get_cipher_by_value(uint16_t value);
 uint16_t ssl3_get_cipher_value(const SSL_CIPHER *c);