Update GnubbyAuthHandler to use the current session ID

remoting/host/security_key/gnubby_auth_handler_linux_unittest.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stddef.h>
 
 #include "base/files/file_path.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 39 matching lines @@
  public:
   GnubbyAuthHandlerLinuxTest()
       : run_loop_(new base::RunLoop()), last_connection_id_received_(-1) {
     EXPECT_TRUE(temp_dir_.CreateUniqueTempDir());
     socket_path_ = temp_dir_.path().Append(kSocketFilename);
     remoting::GnubbyAuthHandler::SetGnubbySocketName(socket_path_);
 
     send_message_callback_ =
         base::Bind(&GnubbyAuthHandlerLinuxTest::SendMessageToClient,
                    base::Unretained(this));
-    auth_handler_ = remoting::GnubbyAuthHandler::Create(send_message_callback_);
+    auth_handler_ =
+        remoting::GnubbyAuthHandler::Create(nullptr, send_message_callback_);
   }
 
   void WaitForSendMessageToClient() {
     run_loop_->Run();
     run_loop_.reset(new base::RunLoop);
   }
 
   void SendMessageToClient(int connection_id, const std::string& data) {
     last_connection_id_received_ = connection_id;
     last_message_received_ = data;
@@ skipping 167 matching lines @@
   net::UnixDomainClientSocket client_socket(socket_path_.value(), false);
   net::TestCompletionCallback connect_callback;
   int rv = client_socket.Connect(connect_callback.callback());
   ASSERT_EQ(net::OK, connect_callback.GetResult(rv));
 
   auth_handler_->SendErrorAndCloseConnection(1);
   ASSERT_EQ(0u, auth_handler_->GetActiveConnectionCountForTest());
 }
 
 }  // namespace remoting