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

chrome/browser/ui/webui/settings/certificates_handler.cc

 // 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.
 
 #include "chrome/browser/ui/webui/settings/certificates_handler.h"
 
 #include <errno.h>
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 468 matching lines @@
   ShowCertificateViewer(web_ui()->GetWebContents(), GetParentWindow(), cert);
 }
 
 void CertificatesHandler::AssignWebUICallbackId(const base::ListValue* args) {
   CHECK_LE(1U, args->GetSize());
   CHECK(webui_callback_id_.empty());
   CHECK(args->GetString(0, &webui_callback_id_));
 }
 
 void CertificatesHandler::HandleGetCATrust(const base::ListValue* args) {
+  AllowJavascript();
+
   CHECK_EQ(2U, args->GetSize());
   AssignWebUICallbackId(args);
   std::string node_id;
   CHECK(args->GetString(1, &node_id));
 
   net::X509Certificate* cert = cert_id_map_->IdToCert(node_id);
   CHECK(cert);
 
   net::NSSCertDatabase::TrustBits trust_bits =
       certificate_manager_model_->cert_db()->GetCertTrust(cert, net::CA_CERT);
@@ skipping 636 matching lines @@
   error_info->Set(kCertificateErrors,
                   base::WrapUnique(cert_error_list.release()));
   RejectCallback(*error_info);
 }
 
 gfx::NativeWindow CertificatesHandler::GetParentWindow() const {
   return web_ui()->GetWebContents()->GetTopLevelNativeWindow();
 }
 
 }  // namespace settings