Slightly simplify SSL3_RECORD.

There's no need to track consumed bytes, so rr->data and rr->off may be
merged together.

Change-Id: I8842d005665ea8b4d4a0cced941f3373872cdac4
Reviewed-on: https://boringssl-review.googlesource.com/6644
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/include/openssl/ssl.h b/include/openssl/ssl.h
index f127947..b89d622 100644
--- a/include/openssl/ssl.h
+++ b/include/openssl/ssl.h
@@ -3894,12 +3894,9 @@
 typedef struct ssl3_record_st {
   /* type is the record type. */
   uint8_t type;
-  /* length is the number of unconsumed bytes of |data|. */
+  /* length is the number of unconsumed bytes in the record. */
   uint16_t length;
-  /* off is the number of consumed bytes of |data|. */
-  uint16_t off;
-  /* data is a non-owning pointer to the record contents. The total length of
-   * the buffer is |off| + |length|. */
+  /* data is a non-owning pointer to the first unconsumed byte of the record. */
   uint8_t *data;
 } SSL3_RECORD;