Adding a Confirmation dialog for It2Me on Windows

remoting/host/it2me/it2me_confirmation_dialog.cc

Index: remoting/host/it2me/it2me_confirmation_dialog.cc
diff --git a/remoting/host/it2me/it2me_confirmation_dialog.cc b/remoting/host/it2me/it2me_confirmation_dialog.cc
index 766be5e41f0a69bf580b4515533d934ef4a1629c..65a2fd354ce9c565d5f454bb632215e66ce13942 100644
--- a/remoting/host/it2me/it2me_confirmation_dialog.cc
+++ b/remoting/host/it2me/it2me_confirmation_dialog.cc
@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "build/build_config.h"
 #include "remoting/host/it2me/it2me_confirmation_dialog.h"
 
 namespace remoting {
@@ -11,12 +10,4 @@ It2MeConfirmationDialogFactory::It2MeConfirmationDialogFactory() {}
 
 It2MeConfirmationDialogFactory::~It2MeConfirmationDialogFactory() {}
 
-// TODO(dcaiafa): Remove after implementations for all platforms exist.
-#if !defined(OS_CHROMEOS)
-std::unique_ptr<It2MeConfirmationDialog>
-It2MeConfirmationDialogFactory::Create() {
-  return nullptr;
-}
-#endif
-
 }  // namespace remoting