[Signin Error Dialog] (3/3) Added the triggering code

chrome/browser/ui/browser.h

 // Copyright (c) 2012 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_BROWSER_H_
 #define CHROME_BROWSER_UI_BROWSER_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 398 matching lines @@
 
   // Closes the tab-modal signin flow opened with ShowModalSigninWindow, if it's
   // open. Does nothing otherwise.
   void CloseModalSigninWindow();
 
   // Shows the tab modal sync confirmation dialog that informs the user about
   // sync and gives them a chance to abort signin under the tab modal signin
   // flow.
   void ShowModalSyncConfirmationWindow();
 
+  // Shows the tab modal signin error dialog that informs the user about
+  // signin errors.
+  void ShowModalSigninErrorWindow();
+
   // Used to register a KeepAlive to affect the Chrome lifetime. The KeepAlive
   // is registered when the browser is added to the browser list, and unregisted
   // when it is removed from it.
   void RegisterKeepAlive();
   void UnregisterKeepAlive();
 
   // Interface implementations ////////////////////////////////////////////////
 
   // Overridden from content::PageNavigator:
   content::WebContents* OpenURL(const content::OpenURLParams& params) override;
@@ skipping 573 matching lines @@
   // The following factory is used for chrome update coalescing.
   base::WeakPtrFactory<Browser> chrome_updater_factory_;
 
   // The following factory is used to close the frame at a later time.
   base::WeakPtrFactory<Browser> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(Browser);
 };
 
 #endif  // CHROME_BROWSER_UI_BROWSER_H_