Disable non Latin keyboard layout on Lock screen and Sign-in screen.

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

 // 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.
 
 #include "chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h"
 
 #include "base/callback.h"
 #include "base/chromeos/chromeos_version.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 322 matching lines @@
   if (!users_lru_input_methods->GetStringWithoutPathExpansion(username,
                                                               &input_method)) {
     DLOG(INFO) << "SetUserInputMethod('" << username
                << "'): no input method for this user";
     return false;
   }
 
   if (input_method.empty())
     return false;
 
-  if (!manager->IsFullLatinKeyboard(input_method)) {
+  if (!manager->IsLoginKeyboard(input_method)) {
     LOG(WARNING) << "SetUserInputMethod('" << username
                  << "'): stored user LRU input method '" << input_method
                  << "' is no longer Full Latin Keyboard Language"
                  << " (entry dropped). Use hardware default instead.";
 
     DictionaryPrefUpdate updater(local_state, prefs::kUsersLRUInputMethod);
 
     base::DictionaryValue* const users_lru_input_methods = updater.Get();
     if (users_lru_input_methods != NULL) {
       users_lru_input_methods->SetStringWithoutPathExpansion(username, "");
@@ skipping 1404 matching lines @@
   rvh->ExecuteJavascriptInWebFrame(
       ASCIIToUTF16("//iframe[@id='signin-frame']\n//iframe"),
       ASCIIToUTF16(code));
 
   // Test properties are cleared in HandleCompleteLogin because the form
   // submission might fail and login will not be attempted after reloading
   // if they are cleared here.
 }
 
 }  // namespace chromeos