Options: disallow bad URLs from being entered as startup pages

chrome/browser/ui/webui/settings_utils.h

 // Copyright 2016 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_UTILS_H_
 #define CHROME_BROWSER_UI_WEBUI_SETTINGS_UTILS_H_
 
+#include <string>
+
 #include "base/macros.h"
 
+class GURL;
+
 namespace content {
 class WebContents;
 }
 
 namespace settings_utils {
 
 // Invoke UI for network proxy settings.
 void ShowNetworkProxySettings(content::WebContents* web_contents);
 
 // Invoke UI for SSL certificates.
 void ShowManageSSLCertificates(content::WebContents* web_contents);
 
+// Returns whether |url_string| is a valid startup page. |fixed_url| is set to
+// the fixed up, valid URL if not null.
+bool FixupAndValidateStartupPage(const std::string& url_string,
+                                 GURL* fixed_url);
+
 }  // namespace settings_utils
 
 #endif  // CHROME_BROWSER_UI_WEBUI_SETTINGS_UTILS_H_