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diff --git a/chrome/browser/dom_ui/browser_options_handler.h b/chrome/browser/dom_ui/browser_options_handler.h
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+++ b/chrome/browser/dom_ui/browser_options_handler.h
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+// Copyright (c) 2010 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_DOM_UI_BROWSER_OPTIONS_HANDLER_H_
+#define CHROME_BROWSER_DOM_UI_BROWSER_OPTIONS_HANDLER_H_
+
+#include "chrome/browser/dom_ui/options_ui.h"
+#include "chrome/browser/search_engines/template_url_model.h"
+#include "chrome/browser/shell_integration.h"
+
+// Chrome browser options page UI handler.
+class BrowserOptionsHandler : public OptionsPageUIHandler,
+                              public ShellIntegration::DefaultBrowserObserver,
+                              public TemplateURLModelObserver {
+ public:
+  BrowserOptionsHandler();
+  virtual ~BrowserOptionsHandler();
+
+  virtual void Initialize();
+
+  // OptionsUIHandler implementation.
+  virtual void GetLocalizedValues(DictionaryValue* localized_strings);
+  virtual void RegisterMessages();
+
+  // ShellIntegration::DefaultBrowserObserver implementation.
+  virtual void SetDefaultBrowserUIState(
+      ShellIntegration::DefaultBrowserUIState state);
+
+  // TemplateURLModelObserver implementation.
+  virtual void OnTemplateURLModelChanged();
+
+ private:
+  // Makes this the default browser. Called from DOMUI.
+  void BecomeDefaultBrowser(const Value* value);
+
+  // Sets the search engine at the given index to be default. Called from DOMUI.
+  void SetDefaultSearchEngine(const Value* value);
+
+  // Returns the string ID for the given default browser state.
+  int StatusStringIdForState(ShellIntegration::DefaultBrowserState state);
+
+  // Gets the current default browser state, and asynchronously reports it to
+  // the DOMUI page.
+  void UpdateDefaultBrowserState();
+
+  // Updates the UI with the given state for the default browser.
+  void SetDefaultBrowserUIString(int status_string_id);
+
+  scoped_refptr<ShellIntegration::DefaultBrowserWorker> default_browser_worker_;
+
+  TemplateURLModel* template_url_model_;  // Weak.
+
+  DISALLOW_COPY_AND_ASSIGN(BrowserOptionsHandler);
+};
+
+#endif  // CHROME_BROWSER_DOM_UI_BROWSER_OPTIONS_HANDLER_H_