Remove "2" suffixes from options2 code.

chrome/browser/ui/webui/options2/startup_pages_handler.h

Index: chrome/browser/ui/webui/options2/startup_pages_handler.h
diff --git a/chrome/browser/ui/webui/options2/startup_pages_handler2.h b/chrome/browser/ui/webui/options2/startup_pages_handler.h
similarity index 94%
rename from chrome/browser/ui/webui/options2/startup_pages_handler2.h
rename to chrome/browser/ui/webui/options2/startup_pages_handler.h
index 42b9ee27a0b14e1cea594fd8e8dd40a2936cf040..264f72d17062d046f733ce11772ad53070d8056c 100644
--- a/chrome/browser/ui/webui/options2/startup_pages_handler2.h
+++ b/chrome/browser/ui/webui/options2/startup_pages_handler.h
@@ -2,8 +2,8 @@
 // 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_OPTIONS2_STARTUP_PAGES_HANDLER2_H_
-#define CHROME_BROWSER_UI_WEBUI_OPTIONS2_STARTUP_PAGES_HANDLER2_H_
+#ifndef CHROME_BROWSER_UI_WEBUI_OPTIONS2_STARTUP_PAGES_HANDLER_H_
+#define CHROME_BROWSER_UI_WEBUI_OPTIONS2_STARTUP_PAGES_HANDLER_H_
 #pragma once
 
 #include "base/memory/ref_counted.h"
@@ -12,7 +12,7 @@
 #include "chrome/browser/autocomplete/autocomplete_controller_delegate.h"
 #include "chrome/browser/prefs/pref_change_registrar.h"
 #include "chrome/browser/prefs/pref_member.h"
-#include "chrome/browser/ui/webui/options2/options_ui2.h"
+#include "chrome/browser/ui/webui/options2/options_ui.h"
 #include "ui/base/models/table_model_observer.h"
 
 class AutocompleteController;
@@ -99,4 +99,4 @@ class StartupPagesHandler : public OptionsPageUIHandler,
 
 }  // namespace options2
 
-#endif  // CHROME_BROWSER_UI_WEBUI_OPTIONS2_STARTUP_PAGES_HANDLER2_H_
+#endif  // CHROME_BROWSER_UI_WEBUI_OPTIONS2_STARTUP_PAGES_HANDLER_H_