[reland] MacViews: Allow the toolkit-views Enterprise Signin Confirmation Dialog to be used

chrome/browser/ui/cocoa/tab_dialogs_views_mac.h

 // Copyright 2017 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 CHROME_BROWSER_UI_COCOA_TAB_DIALOGS_VIEWS_MAC_H_
 #define CHROME_BROWSER_UI_COCOA_TAB_DIALOGS_VIEWS_MAC_H_
 
 #include "chrome/browser/ui/cocoa/tab_dialogs_cocoa.h"
 
 // Implementation of TabDialogs interface for toolkit-views dialogs on Mac.
 class TabDialogsViewsMac : public TabDialogsCocoa {
  public:
   explicit TabDialogsViewsMac(content::WebContents* contents);
   ~TabDialogsViewsMac() override;
 
   // TabDialogs:
   void ShowCollectedCookies() override;
+  void ShowProfileSigninConfirmation(
+      Browser* browser,
+      Profile* profile,
+      const std::string& username,
+      std::unique_ptr<ui::ProfileSigninConfirmationDelegate> delegate) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TabDialogsViewsMac);
 };
 
 #endif  // CHROME_BROWSER_UI_COCOA_TAB_DIALOGS_VIEWS_MAC_H_