Moving It2Me confirmation prompt into the Validation callback flow

remoting/host/it2me/it2me_confirmation_dialog_proxy.h

 // Copyright 2014 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.
 
 #ifndef REMOTING_HOST_IT2ME_IT2ME_CONFIRMATION_DIALOG_PROXY_H_
 #define REMOTING_HOST_IT2ME_IT2ME_CONFIRMATION_DIALOG_PROXY_H_
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
@@ skipping 10 matching lines @@
   // |ui_task_runner| must be the UI thread. It will be used to call into the
   // wrapped dialog.
   // |dialog| is the dialog being wrapped.
   It2MeConfirmationDialogProxy(
       scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner,
       std::unique_ptr<It2MeConfirmationDialog> dialog);
 
   ~It2MeConfirmationDialogProxy() override;
 
   // It2MeConfirmationDialog implementation.
-  void Show(const It2MeConfirmationDialog::ResultCallback& callback) override;
+  void Show(const std::string& remote_user_email,
+            const It2MeConfirmationDialog::ResultCallback& callback) override;
 
  private:
   class Core;
 
   void ReportResult(It2MeConfirmationDialog::Result result);
 
   std::unique_ptr<Core> core_;
   It2MeConfirmationDialog::ResultCallback callback_;
   base::WeakPtrFactory<It2MeConfirmationDialogProxy> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(It2MeConfirmationDialogProxy);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_IT2ME_IT2ME_CONFIRMATION_DIALOG_PROXY_H_