lnrpc: undo GetInfo Chains list deprecation

docs/release-notes/release-notes-0.18.0.md

@@ -270,9 +270,8 @@
 
 * [Remove Litecoin code](https://github.com/lightningnetwork/lnd/pull/7867).
   With this change, the `Bitcoin.Active` config option is now deprecated since
-  Bitcoin is now the only supported chain. The `chains` field in the
-  `lnrpc.GetInfoResponse` message along with the `chain` field in the
-  `lnrpc.Chain` message have also been deprecated for the same reason.
+  Bitcoin is now the only supported chain. The `chain` field in the
+  `lnrpc.Chain` message has also been deprecated for the same reason.
 
 * The payment lifecycle code has been refactored to improve its maintainablity.
   In particular, the complexity involved in the lifecycle loop has been

lnrpc/lightning.proto

@@ -1940,10 +1940,11 @@ message GetInfoResponse {
     reserved 11;
 
     /*
-    Deprecated. The only active chain is bitcoin.
-    A list of active chains the node is connected to
+    A list of active chains the node is connected to. This will only
+    ever contain a single entry since LND will only ever have a single
+    chain backend during its lifetime.
     */
-    repeated Chain chains = 16 [deprecated = true];
+    repeated Chain chains = 16;
 
     // The URIs of the current node.
     repeated string uris = 12;

lnrpc/lightning.swagger.json

@@ -5003,7 +5003,7 @@
           "items": {
             "$ref": "#/definitions/lnrpcChain"
           },
-          "title": "Deprecated. The only active chain is bitcoin.\nA list of active chains the node is connected to"
+          "description": "A list of active chains the node is connected to. This will only\never contain a single entry since LND will only ever have a single\nchain backend during its lifetime."
         },
         "uris": {
           "type": "array",