internal/jsonrpc2: remove Direction

It is no longer used after the changes to the logging system.

Change-Id: I7b96fb8297eb66f2ebad67c74c82fa7ed96c3139
Reviewed-on: https://go-review.googlesource.com/c/tools/+/227485
Run-TryBot: Ian Cottrell <[email protected]>
TryBot-Result: Gobot Gobot <[email protected]>
Reviewed-by: Robert Findley <[email protected]>

Author: ianthehat

internal/jsonrpc2/handler.go

@@ -18,28 +18,6 @@ import (
 // The handler should return ErrNotHandled if it could not handle the request.
 type Handler func(context.Context, *Request) error
 
-// Direction is used to indicate to a logger whether the logged message was being
-// sent or received.
-type Direction bool
-
-const (
-	// Send indicates the message is outgoing.
-	Send = Direction(true)
-	// Receive indicates the message is incoming.
-	Receive = Direction(false)
-)
-
-func (d Direction) String() string {
-	switch d {
-	case Send:
-		return "send"
-	case Receive:
-		return "receive"
-	default:
-		panic("unreachable")
-	}
-}
-
 // MethodNotFound is a Handler that replies to all call requests with the
 // standard method not found response.
 // This should normally be the final handler in a chain.