cros: Remove usage of GaiaScreenHandler outside of login/webui.

chrome/browser/chromeos/login/screens/gaia_screen.cc

 // Copyright 2014 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/screens/gaia_screen.h"
 
-#include "base/logging.h"
-#include "chrome/browser/ui/webui/chromeos/login/gaia_screen_handler.h"
-#include "chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h"
+#include "chrome/browser/chromeos/login/screens/gaia_view.h"
 
 namespace chromeos {
 
-GaiaScreen::GaiaScreen() : legacy_handler_(NULL), screen_handler_(NULL) {
-}
-
-GaiaScreen::~GaiaScreen() {
-}
-
-void GaiaScreen::SetLegacyHandler(LoginDisplayWebUIHandler* handler) {
-  legacy_handler_ = handler;
-}
-
-void GaiaScreen::SetScreenHandler(GaiaScreenHandler* handler) {
-  screen_handler_ = handler;
-}
-
 void GaiaScreen::MaybePreloadAuthExtension() {
-  screen_handler_->MaybePreloadAuthExtension();
+  view_->MaybePreloadAuthExtension();
 }
 
 }  // namespace chromeos