MD Settings: simplify logic for whether themes can be reset

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

 // Copyright (c) 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_APPEARANCE_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_SETTINGS_APPEARANCE_HANDLER_H_
 
 #include "base/macros.h"
 #include "chrome/browser/ui/webui/settings/settings_page_ui_handler.h"
 #include "content/public/browser/notification_observer.h"
@@ skipping 20 matching lines @@
 
   // SettingsPageUIHandler implementation.
   void RegisterMessages() override;
 
  private:
   // content::NotificationObserver implementation.
   void Observe(int type,
                const content::NotificationSource& source,
                const content::NotificationDetails& details) override;
 
-  // Queries the enabled state of the reset-theme control.
-  base::FundamentalValue QueryResetThemeEnabledState();
+  // Whether the theme can be reset.
+  bool ResetThemeEnabled() const;
 
   // Resets the UI theme of the browser to the default theme.
   void ResetTheme(const base::ListValue*);
 
   // Sends the enabled state of the reset-theme control to the JS.
   void GetResetThemeEnabled(const base::ListValue* args);
 
   Profile* profile_;  // Weak pointer.
 
   // Used to register for relevant notifications.
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(AppearanceHandler);
 };
 
 }  // namespace settings
 
 #endif  // CHROME_BROWSER_UI_WEBUI_SETTINGS_APPEARANCE_HANDLER_H_