Remove some resolved "XXXX prop271" comments.

src/or/circuituse.c

@@ -1652,9 +1652,10 @@ circuit_build_failed(origin_circuit_t *circ)
                "Our circuit died before the first hop with no connection");
     }
     if (n_chan_id && !already_marked) {
+      /* New guard API: we failed. */
       if (circ->guard_state)
         entry_guard_failed(&circ->guard_state);
-      /* XXXX prop271 -- old API */
+      /* Old guard API: we failed. */
       entry_guard_register_connect_status(n_chan_id, 0, 1, time(NULL));
       /* if there are any one-hop streams waiting on this circuit, fail
        * them now so they can retry elsewhere. */

src/or/connection_or.c

@@ -735,8 +735,9 @@ connection_or_about_to_close(or_connection_t *or_conn)
       const or_options_t *options = get_options();
       connection_or_note_state_when_broken(or_conn);
       rep_hist_note_connect_failed(or_conn->identity_digest, now);
+      /* Tell the new guard API about the channel failure */
       entry_guard_chan_failed(TLS_CHAN_TO_BASE(or_conn->chan));
-      /* XXXX prop271 -- old API */
+      /* Tell the old guard API about the channel failure */
       entry_guard_register_connect_status(or_conn->identity_digest,0,
                                           !options->HTTPSProxy, now);
       if (conn->state >= OR_CONN_STATE_TLS_HANDSHAKING) {
@@ -1675,8 +1676,9 @@ connection_or_client_learned_peer_id(or_connection_t *conn,
            "Tried connecting to router at %s:%d, but identity key was not "
            "as expected: wanted %s but got %s.%s",
            conn->base_.address, conn->base_.port, expected, seen, extra_log);
+    /* Tell the new guard API about the channel failure */
     entry_guard_chan_failed(TLS_CHAN_TO_BASE(conn->chan));
-    /* XXXX prop271 old API */
+    /* Tell the old guard API about the channel failure */
     entry_guard_register_connect_status(conn->identity_digest, 0, 1,
                                         time(NULL));
     control_event_or_conn_status(conn, OR_CONN_EVENT_FAILED,

src/or/entrynodes.c

@@ -1928,7 +1928,6 @@ entry_guard_has_higher_priority(entry_guard_t *a, entry_guard_t *b)
 void
 circuit_guard_state_free(circuit_guard_state_t *state)
 {
-  /* XXXX prop271 -- do we want to inline this structure? */
   if (!state)
     return;
   entry_guard_handle_free(state->guard);

src/or/entrynodes.h

@@ -226,7 +226,6 @@ typedef enum guard_selection_type_t {
 /**
  * All of the the context for guard selection on a particular client.
  *
- * (XXXX prop271 this paragraph below is not actually implemented yet.)
  * We maintain multiple guard selection contexts for a client, depending
  * aspects on its current configuration -- whether an extremely
  * restrictive EntryNodes is used, whether UseBridges is enabled, and so