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

chrome/browser/ui/webui/settings/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_CERTIFICATES_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_SETTINGS_CERTIFICATES_HANDLER_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 15 matching lines @@
 class CertificatesHandler
     : public SettingsPageUIHandler,
       public CertificateManagerModel::Observer,
       public ui::SelectFileDialog::Listener {
  public:
   explicit CertificatesHandler(bool show_certs_in_modal_dialog);
   ~CertificatesHandler() override;
 
   // SettingsPageUIHandler implementation.
   void RegisterMessages() override;
+  void OnJavascriptAllowed() override {}
+  void OnJavascriptDisallowed() override {}
 
   // CertificateManagerModel::Observer implementation.
   void CertificatesRefreshed() override;
 
   // SelectFileDialog::Listener implementation.
   void FileSelected(const base::FilePath& path,
                     int index,
                     void* params) override;
   void FileSelectionCanceled(void* params) override;
 
@@ skipping 146 matching lines @@
   std::unique_ptr<CertIdMap> cert_id_map_;
 
   base::WeakPtrFactory<CertificatesHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(CertificatesHandler);
 };
 
 }  // namespace settings
 
 #endif  // CHROME_BROWSER_UI_WEBUI_SETTINGS_CERTIFICATES_HANDLER_H_