browser: Rename message_box_handler.* to javascript_dialog_creator.*

chrome/browser/ui/app_modal_dialogs/javascript_dialog_creator.h

 // Copyright (c) 2012 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_APP_MODAL_DIALOGS_MESSAGE_BOX_HANDLER_H_
-#define CHROME_BROWSER_UI_APP_MODAL_DIALOGS_MESSAGE_BOX_HANDLER_H_
+#ifndef CHROME_BROWSER_UI_APP_MODAL_DIALOGS_JAVASCRIPT_DIALOG_CREATOR_H_
+#define CHROME_BROWSER_UI_APP_MODAL_DIALOGS_JAVASCRIPT_DIALOG_CREATOR_H_
 #pragma once
 
 namespace content {
 class JavaScriptDialogCreator;
 }
 
 class ExtensionHost;
 
 // Returns a JavaScriptDialogCreator that creates real dialogs.
 // It returns a Singleton instance of JavaScriptDialogCreator,
 // which should not be deleted.
 content::JavaScriptDialogCreator* GetJavaScriptDialogCreatorInstance();
 
 // Creates and returns a JavaScriptDialogCreator owned by |extension_host|.
 // This is not the Singleton instance, so the caller must delete it.
 content::JavaScriptDialogCreator* CreateJavaScriptDialogCreatorInstance(
     ExtensionHost* extension_host);
 
-#endif  // CHROME_BROWSER_UI_APP_MODAL_DIALOGS_MESSAGE_BOX_HANDLER_H_
+#endif  // CHROME_BROWSER_UI_APP_MODAL_DIALOGS_JAVASCRIPT_DIALOG_CREATOR_H_