Flesh out the location-page class to make it more general.

chrome/browser/ui/webui/settings/content_settings_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_CONTENT_SETTINGS_HANDLER_H_
+#define CHROME_BROWSER_UI_WEBUI_SETTINGS_CONTENT_SETTINGS_HANDLER_H_
+
+#include <vector>
+
+#include "chrome/browser/ui/webui/settings/md_settings_ui.h"
+
+namespace base {
+class Value;
+}
+
+namespace settings {
+
+// Chrome "ContentSettings" settings page UI handler.
+class ContentSettingsHandler : public SettingsPageUIHandler {
+ public:
+  ContentSettingsHandler();
+  ~ContentSettingsHandler() override;
+
+  // SettingsPageUIHandler implementation.
+  void RegisterMessages() override;
+
+ private:
+  void HandleFetchToggleState(const base::ListValue* args);
+  void HandleFetchData(const base::ListValue* args);
+  void HandleToggleChange(const base::ListValue* args);
+
+  DISALLOW_COPY_AND_ASSIGN(ContentSettingsHandler);
+};
+
+}  // namespace settings
+
+#endif  // CHROME_BROWSER_UI_WEBUI_SETTINGS_CONTENT_SETTINGS_HANDLER_H_