This CL replaces e-mail with AccountId in wallpaper manager code.

chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h

 // Copyright (c) 2013 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_WEBUI_CHROMEOS_LOGIN_SIGNIN_SCREEN_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_SIGNIN_SCREEN_HANDLER_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 142 matching lines @@
   virtual void ShowWrongHWIDScreen() = 0;
 
   // Sets the displayed email for the next login attempt. If it succeeds,
   // user's displayed email value will be updated to |email|.
   virtual void SetDisplayEmail(const std::string& email) = 0;
 
   // --------------- Rest of the methods.
   // Cancels user adding.
   virtual void CancelUserAdding() = 0;
 
-  // Load wallpaper for given |username|.
-  virtual void LoadWallpaper(const std::string& username) = 0;
+  // Load wallpaper for given |account_id|.
+  virtual void LoadWallpaper(const AccountId& account_id) = 0;
 
   // Loads the default sign-in wallpaper.
   virtual void LoadSigninWallpaper() = 0;
 
   // Attempts to remove given user.
   virtual void RemoveUser(const AccountId& account_id) = 0;
 
   // Let the delegate know about the handler it is supposed to be using.
   virtual void SetWebUIHandler(LoginDisplayWebUIHandler* webui_handler) = 0;
 
@@ skipping 314 matching lines @@
   scoped_ptr<ErrorScreensHistogramHelper> histogram_helper_;
 
   base::WeakPtrFactory<SigninScreenHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SigninScreenHandler);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_SIGNIN_SCREEN_HANDLER_H_