MD Settings: Fix Appearance home page URL crash

chrome/browser/ui/webui/settings/settings_startup_pages_handler.h

 // Copyright 2015 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_SETTINGS_SETTINGS_STARTUP_PAGES_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_SETTINGS_SETTINGS_STARTUP_PAGES_HANDLER_H_
 
 #include "base/macros.h"
 #include "chrome/browser/custom_home_pages_table_model.h"
 #include "chrome/browser/ui/webui/settings/settings_page_ui_handler.h"
@@ skipping 37 matching lines @@
 
   // Informs the code that the JS page has loaded.
   void HandleOnStartupPrefsPageLoad(const base::ListValue* args);
 
   // Removes the startup page at the given index.
   void HandleRemoveStartupPage(const base::ListValue* args);
 
   // Sets the startup page set to the current pages.
   void HandleSetStartupPagesToCurrentPages(const base::ListValue* args);
 
-  // Handles the "validateStartupPage" message. Passed a URL that might be a
-  // valid startup page.
-  void HandleValidateStartupPage(const base::ListValue* args);
-
   // Stores the current state of the startup page preferences.
   void SaveStartupPagesPref();
 
   // Informs the that the preferences have changed.  It is a callback
   // for the pref changed registrar.
   void UpdateStartupPages();
 
   // Used to observe updates to the preference of the list of URLs to load
   // on startup, which can be updated via sync.
   PrefChangeRegistrar pref_change_registrar_;
 
   // The set of pages to launch on startup.
   CustomHomePagesTableModel startup_custom_pages_table_model_;
 
   DISALLOW_COPY_AND_ASSIGN(StartupPagesHandler);
 };
 
 }  // namespace settings
 
 #endif  // CHROME_BROWSER_UI_WEBUI_SETTINGS_SETTINGS_STARTUP_PAGES_HANDLER_H_