Fix crash on login screen for Athena Chrome

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 <algorithm>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 1308 matching lines @@
 void SigninScreenHandler::HandleShowLoadingTimeoutError() {
   UpdateState(ErrorScreenActor::ERROR_REASON_LOADING_TIMEOUT);
 }
 
 void SigninScreenHandler::HandleUpdateOfflineLogin(bool offline_login_active) {
   offline_login_active_ = offline_login_active;
 }
 
 void SigninScreenHandler::HandleFocusPod(const std::string& user_id) {
   SetUserInputMethod(user_id);
+#if !defined(USE_ATHENA)
+  // TODO(dpolukhin):  crbug.com/408734.
   WallpaperManager::Get()->SetUserWallpaperDelayed(user_id);
+#endif
   ScreenlockBridge::Get()->SetFocusedUser(user_id);
 }
 
 void SigninScreenHandler::HandleHardlockPod(const std::string& user_id) {
   SetAuthType(user_id,
               ScreenlockBridge::LockHandler::FORCE_OFFLINE_PASSWORD,
               base::string16());
   HideUserPodCustomIcon(user_id);
 }
 
@@ skipping 174 matching lines @@
   return gaia_screen_handler_->frame_error();
 }
 
 void SigninScreenHandler::OnCapsLockChanged(bool enabled) {
   caps_lock_enabled_ = enabled;
   if (page_is_ready())
     CallJS("login.AccountPickerScreen.setCapsLockState", caps_lock_enabled_);
 }
 
 }  // namespace chromeos