Don't switch browser locale on secondary user login

chrome/browser/chromeos/login/login_utils.cc

 // 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.
 
 #include "chrome/browser/chromeos/login/login_utils.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/chromeos/chromeos_version.h"
@@ skipping 360 matching lines @@
     // Make sure that the google service username is properly set (we do this
     // on every sign in, not just the first login, to deal with existing
     // profiles that might not have it set yet).
     StringPrefMember google_services_username;
     google_services_username.Init(prefs::kGoogleServicesUsername,
                                   user_profile->GetPrefs());
     const User* user = UserManager::Get()->FindUser(email);
     google_services_username.SetValue(user ? user->display_email() : email);
   }
 
-  RespectLocalePreference(user_profile);
+  // For multi-profile case don't apply profile local because it is not safe.
+  if (UserManager::Get()->GetLoggedInUsers().size() == 1)

[Mr4D (OOO till 08-26), 2013/09/13 23:41:36]

Don't know how this plays into it, but while debugging I have seen that the
login screen is also trying to set the user input locale
(signin_screen_handler.cc(1044)). I guess you should check that out quickly as
well).

Oh and: I am not sure that you can assume that the UserManager is already there.
You might want to check if you have to look at UserManager::IsInitialized().

[Dmitry Polukhin, 2013/09/14 00:28:16]

Good catch! It is place where we can switch input methods (not locale). Fixed.
It must be initialized already because UserManaged initiates profile creation.
But after crash not all user could be loaded, in this case we do want to apply
first user settings (it should be first logged in user) and skip other user
settings.

+    RespectLocalePreference(user_profile);
 }
 
 void LoginUtilsImpl::InitSessionRestoreStrategy() {
   CommandLine* command_line = CommandLine::ForCurrentProcess();
   bool in_app_mode = chrome::IsRunningInForcedAppMode();
 
   // Are we in kiosk app mode?
   if (in_app_mode) {
     if (command_line->HasSwitch(::switches::kAppModeOAuth2Token)) {
       oauth2_refresh_token_ = command_line->GetSwitchValueASCII(
@@ skipping 412 matching lines @@
 bool LoginUtils::IsWhitelisted(const std::string& username) {
   CrosSettings* cros_settings = CrosSettings::Get();
   bool allow_new_user = false;
   cros_settings->GetBoolean(kAccountsPrefAllowNewUser, &allow_new_user);
   if (allow_new_user)
     return true;
   return cros_settings->FindEmailInList(kAccountsPrefUsers, username);
 }
 
 }  // namespace chromeos