cros: Break BaseScreenHandler into two classes.

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

Index: chrome/browser/ui/webui/chromeos/login/core_oobe_handler.h
diff --git a/chrome/browser/ui/webui/chromeos/login/core_oobe_handler.h b/chrome/browser/ui/webui/chromeos/login/core_oobe_handler.h
index 33a11e9ed8992ad794e3029fcb119fa853fdfeae..2e53a0775db9cce2f1b4434d9981691915cddfed 100644
--- a/chrome/browser/ui/webui/chromeos/login/core_oobe_handler.h
+++ b/chrome/browser/ui/webui/chromeos/login/core_oobe_handler.h
@@ -16,7 +16,7 @@
 #include "chrome/browser/chromeos/login/demo_mode/demo_mode_detector.h"
 #include "chrome/browser/chromeos/login/screens/core_oobe_view.h"
 #include "chrome/browser/chromeos/login/version_info_updater.h"
-#include "chrome/browser/ui/webui/chromeos/login/base_screen_handler.h"
+#include "chrome/browser/ui/webui/chromeos/login/base_webui_handler.h"
 #include "ui/events/event_source.h"
 #include "ui/keyboard/scoped_keyboard_disabler.h"
 
@@ -34,7 +34,7 @@ class HelpAppLauncher;
 class OobeUI;
 
 // The core handler for Javascript messages related to the "oobe" view.
-class CoreOobeHandler : public BaseScreenHandler,
+class CoreOobeHandler : public BaseWebUIHandler,
                         public VersionInfoUpdater::Delegate,
                         public CoreOobeView,
                         public ui::EventSource {