gossipd: remove --dev-gossip-time setting, we'll use CLN_DEV_SET_TIME.

diff --git a/gossipd/gossipd.c b/gossipd/gossipd.c
index a3661912..629059d2 100644
--- a/gossipd/gossipd.c
+++ b/gossipd/gossipd.c
@@ -367,19 +367,11 @@ static void master_or_connectd_gone(struct daemon_conn *dc UNUSED)
 	exit(2);
 }
 
-struct timeabs gossip_time_now(const struct daemon *daemon)
-{
-	if (daemon->dev_gossip_time)
-		return *daemon->dev_gossip_time;
-
-	return time_now();
-}
-
 /* We don't check this when loading from the gossip_store: that would break
  * our canned tests, and usually old gossip is better than no gossip */
 bool timestamp_reasonable(const struct daemon *daemon, u32 timestamp)
 {
-	u64 now = gossip_time_now(daemon).ts.tv_sec;
+	u64 now = time_now().ts.tv_sec;
 
 	/* More than one day ahead? */
 	if (timestamp > now + 24*60*60)
@@ -393,27 +385,16 @@ bool timestamp_reasonable(const struct daemon *daemon, u32 timestamp)
 /*~ Parse init message from lightningd: starts the daemon properly. */
 static void gossip_init(struct daemon *daemon, const u8 *msg)
 {
-	u32 *dev_gossip_time;
-
 	if (!fromwire_gossipd_init(daemon, msg,
 				     &chainparams,
 				     &daemon->our_features,
 				     &daemon->id,
-				     &dev_gossip_time,
 				     &daemon->dev_fast_gossip,
 				     &daemon->dev_fast_gossip_prune,
 				     &daemon->autoconnect_seeker_peers)) {
 		master_badmsg(WIRE_GOSSIPD_INIT, msg);
 	}
 
-	if (dev_gossip_time) {
-		assert(daemon->developer);
-		daemon->dev_gossip_time = tal(daemon, struct timeabs);
-		daemon->dev_gossip_time->ts.tv_sec = *dev_gossip_time;
-		daemon->dev_gossip_time->ts.tv_nsec = 0;
-		tal_free(dev_gossip_time);
-	}
-
 	/* Gossmap manager starts up */
 	daemon->gm = gossmap_manage_new(daemon, daemon);
 
@@ -481,18 +462,6 @@ static void dev_gossip_memleak(struct daemon *daemon, const u8 *msg)
 							      found_leak)));
 }
 
-static void dev_gossip_set_time(struct daemon *daemon, const u8 *msg)
-{
-	u32 time;
-
-	if (!fromwire_gossipd_dev_set_time(msg, &time))
-		master_badmsg(WIRE_GOSSIPD_DEV_SET_TIME, msg);
-	if (!daemon->dev_gossip_time)
-		daemon->dev_gossip_time = tal(daemon, struct timeabs);
-	daemon->dev_gossip_time->ts.tv_sec = time;
-	daemon->dev_gossip_time->ts.tv_nsec = 0;
-}
-
 /*~ lightningd tells us when about a gossip message directly, when told to by
  * the addgossip RPC call.  That's usually used when a plugin gets an update
  * returned in an payment error. */
@@ -584,12 +553,6 @@ static struct io_plan *recv_req(struct io_conn *conn,
 			goto done;
 		}
 		/* fall thru */
-	case WIRE_GOSSIPD_DEV_SET_TIME:
-		if (daemon->developer) {
-			dev_gossip_set_time(daemon, msg);
-			goto done;
-		}
-		/* fall thru */
 
 	/* We send these, we don't receive them */
 	case WIRE_GOSSIPD_INIT_CUPDATE:
@@ -623,7 +586,6 @@ int main(int argc, char *argv[])
 
 	daemon = tal(NULL, struct daemon);
 	daemon->developer = developer;
-	daemon->dev_gossip_time = NULL;
 	daemon->peers = new_htable(daemon, peer_node_id_map);
 	daemon->deferred_txouts = tal_arr(daemon, struct short_channel_id, 0);
 	daemon->current_blockheight = 0; /* i.e. unknown */
diff --git a/gossipd/gossipd.h b/gossipd/gossipd.h
index 9ee193e5..d558f58f 100644
--- a/gossipd/gossipd.h
+++ b/gossipd/gossipd.h
@@ -66,9 +66,6 @@ struct daemon {
 	/* Features lightningd told us to set. */
 	struct feature_set *our_features;
 
-	/* Override local time for gossip messages */
-	struct timeabs *dev_gossip_time;
-
 	/* Speed up gossip. */
 	bool dev_fast_gossip;
 
@@ -164,13 +161,6 @@ void tell_lightningd_peer_update(struct daemon *daemon,
 				 struct amount_msat htlc_minimum,
 				 struct amount_msat htlc_maximum);
 
-/**
- * Get the local time.
- *
- * This gets overridden in dev mode so we can use canned (stale) gossip.
- */
-struct timeabs gossip_time_now(const struct daemon *daemon);
-
 /**
  * Is this gossip timestamp reasonable?
  */
diff --git a/gossipd/gossipd_wire.csv b/gossipd/gossipd_wire.csv
index c5868eb7..1721b3ae 100644
--- a/gossipd/gossipd_wire.csv
+++ b/gossipd/gossipd_wire.csv
@@ -9,7 +9,6 @@ msgtype,gossipd_init,3000
 msgdata,gossipd_init,chainparams,chainparams,
 msgdata,gossipd_init,our_features,feature_set,
 msgdata,gossipd_init,id,node_id,
-msgdata,gossipd_init,dev_gossip_time,?u32,
 msgdata,gossipd_init,dev_fast_gossip,bool,
 msgdata,gossipd_init,dev_fast_gossip_prune,bool,
 msgdata,gossipd_init,autoconnect_seeker_peers,u32,
@@ -27,10 +26,6 @@ msgdata,gossipd_init_nannounce,nannounce,u8,len
 
 msgtype,gossipd_init_reply,3100
 
-# In developer mode, we can mess with time.
-msgtype,gossipd_dev_set_time,3001
-msgdata,gossipd_dev_set_time,dev_gossip_time,u32,
-
 # Gossipd->master get this tx output please.
 msgtype,gossipd_get_txout,3018
 msgdata,gossipd_get_txout,short_channel_id,short_channel_id,
diff --git a/gossipd/gossmap_manage.c b/gossipd/gossmap_manage.c
index bf4faee5..b93c091a 100644
--- a/gossipd/gossmap_manage.c
+++ b/gossipd/gossmap_manage.c
@@ -357,7 +357,7 @@ static bool channel_already_dying(const struct chan_dying dying_channels[],
 /* Every half a week we look for dead channels (faster in dev) */
 static void prune_network(struct gossmap_manage *gm)
 {
-	u64 now = gossip_time_now(gm->daemon).ts.tv_sec;
+	u64 now = time_now().ts.tv_sec;
 	/* Anything below this highwater mark ought to be pruned */
 	const s64 highwater = now - GOSSIP_PRUNE_INTERVAL(gm->daemon->dev_fast_gossip_prune);
 	const struct gossmap_node *me;
diff --git a/lightningd/gossip_control.c b/lightningd/gossip_control.c
index 0043de96..0f013b76 100644
--- a/lightningd/gossip_control.c
+++ b/lightningd/gossip_control.c
@@ -192,7 +192,6 @@ static unsigned gossip_msg(struct subd *gossip, const u8 *msg, const int *fds)
 	case WIRE_GOSSIPD_GET_TXOUT_REPLY:
 	case WIRE_GOSSIPD_OUTPOINTS_SPENT:
 	case WIRE_GOSSIPD_DEV_MEMLEAK:
-	case WIRE_GOSSIPD_DEV_SET_TIME:
 	case WIRE_GOSSIPD_NEW_BLOCKHEIGHT:
 	case WIRE_GOSSIPD_ADDGOSSIP:
 	/* This is a reply, so never gets through to here. */
@@ -319,7 +318,6 @@ void gossip_init(struct lightningd *ld, int connectd_fd)
 	    chainparams,
 	    ld->our_features,
 	    &ld->our_nodeid,
-	    ld->dev_gossip_time ? &ld->dev_gossip_time: NULL,
 	    ld->dev_fast_gossip,
 	    ld->dev_fast_gossip_prune,
 	    ld->autoconnect_seeker_peers);
@@ -488,29 +486,3 @@ static const struct json_command dev_set_max_scids_encode_size = {
 	.dev_only = true,
 };
 AUTODATA(json_command, &dev_set_max_scids_encode_size);
-
-static struct command_result *json_dev_gossip_set_time(struct command *cmd,
-						       const char *buffer,
-						       const jsmntok_t *obj UNNEEDED,
-						       const jsmntok_t *params)
-{
-	u8 *msg;
-	u32 *time;
-
-	if (!param(cmd, buffer, params,
-		   p_req("time", param_number, &time),
-		   NULL))
-		return command_param_failed();
-
-	msg = towire_gossipd_dev_set_time(NULL, *time);
-	subd_send_msg(cmd->ld->gossip, take(msg));
-
-	return command_success(cmd, json_stream_success(cmd));
-}
-
-static const struct json_command dev_gossip_set_time = {
-	"dev-gossip-set-time",
-	json_dev_gossip_set_time,
-	.dev_only = true,
-};
-AUTODATA(json_command, &dev_gossip_set_time);
diff --git a/lightningd/lightningd.c b/lightningd/lightningd.c
index d2d4e525..7e0bf26c 100644
--- a/lightningd/lightningd.c
+++ b/lightningd/lightningd.c
@@ -125,7 +125,6 @@ static struct lightningd *new_lightningd(const tal_t *ctx)
 	ld->dev_disconnect_fd = -1;
 	ld->dev_subdaemon_fail = false;
 	ld->dev_allow_localhost = false;
-	ld->dev_gossip_time = 0;
 	ld->dev_fast_gossip = false;
 	ld->dev_fast_gossip_prune = false;
 	ld->dev_throttle_gossip = false;
diff --git a/lightningd/lightningd.h b/lightningd/lightningd.h
index 6415e659..2d3f028d 100644
--- a/lightningd/lightningd.h
+++ b/lightningd/lightningd.h
@@ -305,9 +305,6 @@ struct lightningd {
 	/* Allow and accept localhost node_announcement addresses */
 	bool dev_allow_localhost;
 
-	/* Timestamp to use for gossipd, iff non-zero */
-	u32 dev_gossip_time;
-
 	/* Speedup gossip propagation, for testing. */
 	bool dev_fast_gossip;
 	bool dev_fast_gossip_prune;
diff --git a/lightningd/options.c b/lightningd/options.c
index 2175d434..02b84877 100644
--- a/lightningd/options.c
+++ b/lightningd/options.c
@@ -824,10 +824,6 @@ static void dev_register_opts(struct lightningd *ld)
 		     opt_set_bool,
 		     &ld->dev_fast_gossip_prune,
 		     "Make gossip pruning 120 seconds");
-	clnopt_witharg("--dev-gossip-time", OPT_DEV|OPT_SHOWINT,
-		       opt_set_u32, opt_show_u32,
-		       &ld->dev_gossip_time,
-		       "UNIX time to override gossipd to use.");
 	clnopt_witharg("--dev-force-privkey", OPT_DEV,
 		       opt_force_privkey, NULL, ld,
 		       "Force HSM to use this as node private key");