Merge #14297: [RPC] Remove warning for removed estimatefee RPC

1eb9a9b [RPC] Remove warning for removed estimatefee RPC (John Newbery)

Pull request description:

  The  RPC was removed in a previous version, but a warning was
  left for users to use the estimatesmartfee RPC. Remove that warning now
  that estimatefee has been gone for over one version.

Tree-SHA512: 7fb440a354a5058f9e95930306d7fe0c1cba6563b9a44b7388a17d9e5c3cff42023f5aa1728fd94a1a11249ea4a8615a8a891afe4fa81ae46b61c2aa08e9cc47

Author: MarcoFalke

src/rpc/mining.cpp

@@ -795,12 +795,6 @@ static UniValue submitheader(const JSONRPCRequest& request)
     throw JSONRPCError(RPC_VERIFY_ERROR, state.GetRejectReason());
 }
 
-static UniValue estimatefee(const JSONRPCRequest& request)
-{
-    throw JSONRPCError(RPC_METHOD_DEPRECATED, "estimatefee was removed in v0.17.\n"
-        "Clients should use estimatesmartfee.");
-}
-
 static UniValue estimatesmartfee(const JSONRPCRequest& request)
 {
     if (request.fHelp || request.params.size() < 1 || request.params.size() > 2)
@@ -978,7 +972,6 @@ static const CRPCCommand commands[] =
 
     { "generating",         "generatetoaddress",      &generatetoaddress,      {"nblocks","address","maxtries"} },
 
-    { "hidden",             "estimatefee",            &estimatefee,            {} },
     { "util",               "estimatesmartfee",       &estimatesmartfee,       {"conf_target", "estimate_mode"} },
 
     { "hidden",             "estimaterawfee",         &estimaterawfee,         {"conf_target", "threshold"} },