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

chrome/browser/ui/webui/chromeos/login/gaia_screen_handler.h

 // Copyright 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_GAIA_SCREEN_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_GAIA_SCREEN_HANDLER_H_
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "chrome/browser/chromeos/login/screens/core_oobe_view.h"
+#include "chrome/browser/chromeos/login/screens/gaia_view.h"
 #include "chrome/browser/ui/webui/chromeos/login/base_screen_handler.h"
 #include "chrome/browser/ui/webui/chromeos/login/network_state_informer.h"
 #include "chromeos/network/portal_detector/network_portal_detector.h"
 #include "net/base/net_errors.h"
 #include "third_party/cros_system_api/dbus/service_constants.h"
 
 class AccountId;
 
 namespace authpolicy {
 class ActiveDirectoryAccountData;
 }
 
 namespace chromeos {
 
 class Key;
 class SigninScreenHandler;
 class SigninScreenHandlerDelegate;
 
 // A class that handles WebUI hooks in Gaia screen.
 class GaiaScreenHandler : public BaseScreenHandler,
+                          public GaiaView,
                           public NetworkPortalDetector::Observer {
  public:
   enum FrameState {
     FRAME_STATE_UNKNOWN = 0,
     FRAME_STATE_LOADING,
     FRAME_STATE_LOADED,
     FRAME_STATE_ERROR
   };
 
   GaiaScreenHandler(
       CoreOobeView* core_oobe_actor,
       const scoped_refptr<NetworkStateInformer>& network_state_informer);
   ~GaiaScreenHandler() override;
 
-  // Decides whether an auth extension should be pre-loaded. If it should,
-  // pre-loads it.
-  void MaybePreloadAuthExtension();
-
-  void DisableRestrictiveProxyCheckForTest();
+  // GaiaView:
+  void MaybePreloadAuthExtension() override;
+  void DisableRestrictiveProxyCheckForTest() override;
 
  private:
   // TODO (antrim@): remove this dependency.
   friend class SigninScreenHandler;
 
   struct GaiaContext;
 
   void LoadGaia(const GaiaContext& context);
 
   // Callback that loads GAIA after version information has been retrieved.
@@ skipping 213 matching lines @@
   bool auth_extension_being_loaded_ = false;
 
   base::WeakPtrFactory<GaiaScreenHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GaiaScreenHandler);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_GAIA_SCREEN_HANDLER_H_