MD Settings: Fix Appearance home page URL crash

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

Index: chrome/browser/ui/webui/settings/on_startup_handler.h
diff --git a/chrome/browser/ui/webui/settings/on_startup_handler.h b/chrome/browser/ui/webui/settings/on_startup_handler.h
index b2975969794d14f75b251ef6886bd51d1b1d66e6..013d1d98ff8199b261767996024245bebcceaa8e 100644
--- a/chrome/browser/ui/webui/settings/on_startup_handler.h
+++ b/chrome/browser/ui/webui/settings/on_startup_handler.h
@@ -28,6 +28,10 @@ class OnStartupHandler : public SettingsPageUIHandler {
   // Handler for the "getNtpExtension" message. No arguments.
   void HandleGetNtpExtension(const base::ListValue* /*args*/);
 
+  // Handles the "validateStartupPage" message. Passed a URL that might be a
+  // valid startup page.
+  void HandleValidateStartupPage(const base::ListValue* args);
+
   DISALLOW_COPY_AND_ASSIGN(OnStartupHandler);
 };