remove P2PServer method from les, unnecessary

Author: renaynay

les/client.go

@@ -18,7 +18,6 @@
 package les
 
 import (
-	"errors"
 	"fmt"
 	"time"
 
@@ -277,15 +276,6 @@ func (s *LightEthereum) Protocols() []p2p.Protocol {
 	}, s.dialCandidates)
 }
 
-// P2PServer registers the node's running p2p server with the Backend.
-func (s *LightEthereum) P2PServer(server *p2p.Server) error {
-	if server == nil {
-		return errors.New("p2p server is not running, cannot register with les backend") // TODO is this error message okay?
-	}
-	s.p2pServer = server
-	return nil
-}
-
 // Start implements node.Lifecycle, starting all internal goroutines needed by the
 // light ethereum protocol implementation.
 func (s *LightEthereum) Start() error {