cros: Move call js prefix out of ctor.

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

 // 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_SUPERVISED_USER_CREATION_SCREEN_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_SUPERVISED_USER_CREATION_SCREEN_HANDLER_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 114 matching lines @@
 
   void HandleGetImages();
   void HandlePhotoTaken(const std::string& image_url);
   void HandleTakePhoto();
   void HandleDiscardPhoto();
   void HandleSelectImage(const std::string& image_url,
                          const std::string& image_type);
 
   void UpdateText(const std::string& element_id, const base::string16& text);
 
-  Delegate* delegate_;
+  Delegate* delegate_ = nullptr;
 
   DISALLOW_COPY_AND_ASSIGN(SupervisedUserCreationScreenHandler);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_SUPERVISED_USER_CREATION_SCREEN_HANDLER_H_