Fix wallpaper change to a random one when user first click "set wallpaper".

chrome/browser/chromeos/login/mock_user_manager.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_CHROMEOS_LOGIN_MOCK_USER_MANAGER_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_MOCK_USER_MANAGER_H_
 #pragma once
 
 #include <string>
 
@@ skipping 15 matching lines @@
   MOCK_METHOD1(EphemeralUserLoggedIn, void(const std::string&));
   MOCK_METHOD2(RemoveUser, void(const std::string&, RemoveUserDelegate*));
   MOCK_METHOD1(RemoveUserFromList, void(const std::string&));
   MOCK_CONST_METHOD1(IsKnownUser, bool(const std::string&));
   MOCK_CONST_METHOD1(FindUser, const User*(const std::string&));
   MOCK_CONST_METHOD1(IsDisplayNameUnique, bool(const std::string&));
   MOCK_METHOD2(SaveUserOAuthStatus, void(const std::string&,
                                          User::OAuthTokenStatus));
   MOCK_METHOD2(SaveUserDisplayEmail, void(const std::string&,
                                           const std::string&));
-  MOCK_METHOD1(GetUserWallpaper, int(const std::string&));
-  MOCK_METHOD2(SaveWallpaperDefaultIndex, void(const std::string&, int));
+  MOCK_METHOD0(GetUserWallpaperIndex, int(void));
+  MOCK_METHOD1(SaveUserWallpaperIndex, void(int));
   MOCK_CONST_METHOD1(GetUserDisplayEmail, std::string(const std::string&));
   MOCK_METHOD2(SaveUserDefaultImageIndex, void(const std::string&, int));
   MOCK_METHOD2(SaveUserImage, void(const std::string&, const SkBitmap&));
   MOCK_METHOD2(SaveUserImageFromFile, void(const std::string&,
                                            const FilePath&));
   MOCK_METHOD1(SaveUserImageFromProfileImage, void(const std::string&));
   MOCK_METHOD1(DownloadProfileImage, void(const std::string&));
   MOCK_CONST_METHOD0(IsCurrentUserOwner, bool(void));
   MOCK_CONST_METHOD0(IsCurrentUserNew, bool(void));
   MOCK_CONST_METHOD0(IsCurrentUserEphemeral, bool(void));
@@ skipping 16 matching lines @@
 
   // Sets a new User instance.
   void SetLoggedInUser(const std::string& email, bool guest);
 
   User* user_;
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_MOCK_USER_MANAGER_H_