Update SteamUnifiedMessages

Ref: SteamDatabase/Protobufs@a4ba0a9#diff-8c71af55a84f0c6b8934be579e14c58d
Ref: SteamRE/SteamKit@78cb22e#diff-93bb6b46ca2dbfcbb1ab76912d01c2e1
Ref: SteamRE/SteamKit@f0cc569#diff-cbf787cd1d4cd513debd638eee688cf8

lib/handlers/unified_messages/index.js

@@ -22,17 +22,17 @@ require('util').inherits(SteamUnifiedMessages, EventEmitter);
 
 SteamUnifiedMessages.prototype.send = function(methodName, body, callback) {
   var eresult;
-  Steam.Unified.Internal[this._service][methodName](function(method, req, cb) {
+  Steam.Internal[this._service][methodName](function(method, req, cb) {
     this._client.send({
-      msg: EMsg.ClientServiceMethod,
+      msg: EMsg.ClientServiceMethodLegacy,
       proto: {}
-    }, new schema.CMsgClientServiceMethod({
+    }, new schema.CMsgClientServiceMethodLegacy({
       method_name: this._service + '.' + methodName + '#1',
       serialized_method: req.toBuffer(),
       is_notification: !callback
     }).toBuffer(), callback && function(header, body) {
       eresult = header.proto.eresult;
-      var resp = schema.CMsgClientServiceMethodResponse.decode(body);
+      var resp = schema.CMsgClientServiceMethodLegacyResponse.decode(body);
       cb(null, resp.serialized_method_response);
     });
   }.bind(this), body, function(err, res) {
@@ -51,7 +51,7 @@ handlers[EMsg.ServiceMethod] = function(header, body) {
   if (jobName.split('.')[0] != this._service)
     return;
   var methodName = jobName.split(/\W/)[1];
-  Steam.Unified.Internal[this._service][methodName](function(method, req) {
+  Steam.Internal[this._service][methodName](function(method, req) {
     this.emit('message', methodName, Steam._processProto(req));
   }.bind(this), body);
 };