src: remove unused variables

These were causing compilation warnings.

PR-URL: #26590
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Yuta Hiroto <hello@hiroppy.me>
Reviewed-By: Refael Ackermann <refack@gmail.com>

Author: cjihrig

src/node_messaging.cc

@@ -725,7 +725,6 @@ void MessagePort::Stop() {
 }
 
 void MessagePort::Start(const FunctionCallbackInfo<Value>& args) {
-  Environment* env = Environment::GetCurrent(args);
   MessagePort* port;
   ASSIGN_OR_RETURN_UNWRAP(&port, args.This());
   if (!port->data_) {
@@ -735,7 +734,6 @@ void MessagePort::Start(const FunctionCallbackInfo<Value>& args) {
 }
 
 void MessagePort::Stop(const FunctionCallbackInfo<Value>& args) {
-  Environment* env = Environment::GetCurrent(args);
   MessagePort* port;
   CHECK(args[0]->IsObject());
   ASSIGN_OR_RETURN_UNWRAP(&port, args[0].As<Object>());