MD Settings: Convert C++ handlers to be JavaScript-lifecycle aware.

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

 // Copyright 2016 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_NATIVE_CERTIFICATES_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_SETTINGS_NATIVE_CERTIFICATES_HANDLER_H_
 
 #include "base/macros.h"
 #include "chrome/browser/ui/webui/settings/settings_page_ui_handler.h"
 
 namespace settings {
 
 class NativeCertificatesHandler : public SettingsPageUIHandler {
  public:
   NativeCertificatesHandler();
   ~NativeCertificatesHandler() override;
 
   // SettingsPageUIHandler implementation.
   void RegisterMessages() override;
+  void OnJavascriptAllowed() override {}
+  void OnJavascriptDisallowed() override {}
 
   // Callback for the "showManageSSLCertificates" message. This will invoke
   // an appropriate certificate management action based on the platform.
   void HandleShowManageSSLCertificates(const base::ListValue* args);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(NativeCertificatesHandler);
 };
 
 }  // namespace settings
 
 #endif  // CHROME_BROWSER_UI_WEBUI_SETTINGS_NATIVE_CERTIFICATES_HANDLER_H_