Simplify adding callbacks.

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 0c15f245d3c72e81ac0a2301b31e8d45878f3b44..1731d47bd8a1e162414029e18e180d67fa42ba0a 100644
--- a/chrome/browser/ui/webui/chromeos/login/core_oobe_handler.h
+++ b/chrome/browser/ui/webui/chromeos/login/core_oobe_handler.h
@@ -5,15 +5,13 @@
 #ifndef CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_CORE_OOBE_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_CORE_OOBE_HANDLER_H_
 
+#include <string>
+
 #include "chrome/browser/chromeos/login/version_info_updater.h"
 #include "chrome/browser/ui/webui/chromeos/login/base_screen_handler.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
-namespace base {
-class ListValue;
-}
-
 namespace chromeos {
 
 class OobeUI;
@@ -58,12 +56,12 @@ class CoreOobeHandler : public BaseScreenHandler,
 
  private:
   // Handlers for JS WebUI messages.
-  void HandleEnableHighContrast(const base::ListValue* args);
-  void HandleEnableScreenMagnifier(const base::ListValue* args);
-  void HandleEnableSpokenFeedback(const base::ListValue* args);
-  void HandleInitialized(const base::ListValue* args);
-  void HandleSkipUpdateEnrollAfterEula(const base::ListValue* args);
-  void HandleUpdateCurrentScreen(const base::ListValue* args);
+  void HandleEnableHighContrast(bool enabled);
+  void HandleEnableScreenMagnifier(bool enabled);
+  void HandleEnableSpokenFeedback();
+  void HandleInitialized();
+  void HandleSkipUpdateEnrollAfterEula();
+  void HandleUpdateCurrentScreen(const std::string& screen);
 
   // Updates a11y menu state based on the current a11y features state(on/off).
   void UpdateA11yState();