Simplify adding callbacks.

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

Index: chrome/browser/ui/webui/chromeos/login/network_screen_handler.h
diff --git a/chrome/browser/ui/webui/chromeos/login/network_screen_handler.h b/chrome/browser/ui/webui/chromeos/login/network_screen_handler.h
index f193d78f4a5af201584f4fe9160cb6221a893894..49d8265446a4c6a168b425658802731670819abb 100644
--- a/chrome/browser/ui/webui/chromeos/login/network_screen_handler.h
+++ b/chrome/browser/ui/webui/chromeos/login/network_screen_handler.h
@@ -5,15 +5,13 @@
 #ifndef CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_NETWORK_SCREEN_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_NETWORK_SCREEN_HANDLER_H_
 
+#include <string>
+
 #include "base/compiler_specific.h"
 #include "chrome/browser/chromeos/login/screens/network_screen_actor.h"
 #include "chrome/browser/ui/webui/chromeos/login/base_screen_handler.h"
 #include "ui/gfx/point.h"
 
-namespace base {
-class ListValue;
-}
-
 namespace chromeos {
 
 // WebUI implementation of NetworkScreenActor. It is used to interact with
@@ -45,13 +43,13 @@ class NetworkScreenHandler : public NetworkScreenActor,
 
  private:
   // Handles moving off the screen.
-  void HandleOnExit(const base::ListValue* args);
+  void HandleOnExit();
 
   // Handles change of the language.
-  void HandleOnLanguageChanged(const base::ListValue* args);
+  void HandleOnLanguageChanged(const std::string& locale);
 
   // Handles change of the input method.
-  void HandleOnInputMethodChanged(const base::ListValue* args);
+  void HandleOnInputMethodChanged(const std::string& id);
 
   // Returns available languages. Caller gets the ownership. Note, it does
   // depend on the current locale.