Remove the 'ssl_' prefix on most SSL_PROTOCOL_METHOD hooks.

It doesn't really convey anything useful. Leave ssl_get_message alone for now
since it's called everywhere in the handshake and I'm about to tweak it
further.

Change-Id: I6f3a74c170e818f624be8fbe5cf6b796353406df
Reviewed-on: https://boringssl-review.googlesource.com/8430
Reviewed-by: Adam Langley <agl@google.com>

ssl/ssl_lib.c

diff --git a/ssl/ssl_lib.c b/ssl/ssl_lib.c
index 5da339d..a7070d1 100644
--- a/ssl/ssl_lib.c
+++ b/ssl/ssl_lib.c
@@ -642,7 +642,7 @@
     }
   }
 
-  return ssl->method->ssl_read_app_data(ssl, buf, num, peek);
+  return ssl->method->read_app_data(ssl, buf, num, peek);
 }
 
 int SSL_read(SSL *ssl, void *buf, int num) {
@@ -681,7 +681,7 @@
     }
   }
 
-  return ssl->method->ssl_write_app_data(ssl, buf, num);
+  return ssl->method->write_app_data(ssl, buf, num);
 }
 
 int SSL_shutdown(SSL *ssl) {
@@ -719,12 +719,12 @@
     }
   } else if (ssl->s3->alert_dispatch) {
     /* Finish sending the close_notify. */
-    if (ssl->method->ssl_dispatch_alert(ssl) <= 0) {
+    if (ssl->method->dispatch_alert(ssl) <= 0) {
       return -1;
     }
   } else if (ssl->s3->recv_shutdown != ssl_shutdown_close_notify) {
     /* Wait for the peer's close_notify. */
-    ssl->method->ssl_read_close_notify(ssl);
+    ssl->method->read_close_notify(ssl);
     if (ssl->s3->recv_shutdown != ssl_shutdown_close_notify) {
       return -1;
     }