Change infobar creation to use a public static Create() method on the infobar delegate classes.

chrome/browser/download/download_request_infobar_delegate.cc

 // Copyright (c) 2012 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/download/download_request_infobar_delegate.h"
 
 #include "chrome/browser/api/infobars/infobar_service.h"
 #include "grit/generated_resources.h"
 #include "grit/theme_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
 
+DownloadRequestInfoBarDelegate::~DownloadRequestInfoBarDelegate() {
+  if (host_)
+    host_->Cancel();
+}
+
+// static
+void DownloadRequestInfoBarDelegate::Create(
+    InfoBarService* infobar_service,
+    DownloadRequestLimiter::TabDownloadState* host) {
+  infobar_service->AddInfoBar(scoped_ptr<InfoBarDelegate>(
+      new DownloadRequestInfoBarDelegate(infobar_service, host)));
+}
+
 DownloadRequestInfoBarDelegate::DownloadRequestInfoBarDelegate(
     InfoBarService* infobar_service,
     DownloadRequestLimiter::TabDownloadState* host)
     : ConfirmInfoBarDelegate(infobar_service),
       host_(host) {
 }
 
-DownloadRequestInfoBarDelegate::~DownloadRequestInfoBarDelegate() {
-  if (host_)
-    host_->Cancel();
-}
-
 gfx::Image* DownloadRequestInfoBarDelegate::GetIcon() const {
   return &ResourceBundle::GetSharedInstance().GetNativeImageNamed(
       IDR_INFOBAR_MULTIPLE_DOWNLOADS);
 }
 
 string16 DownloadRequestInfoBarDelegate::GetMessageText() const {
   return l10n_util::GetStringUTF16(IDS_MULTI_DOWNLOAD_WARNING);
 }
 
 string16 DownloadRequestInfoBarDelegate::GetButtonLabel(
     InfoBarButton button) const {
   return l10n_util::GetStringUTF16((button == BUTTON_OK) ?
       IDS_MULTI_DOWNLOAD_WARNING_ALLOW : IDS_MULTI_DOWNLOAD_WARNING_DENY);
 }
 
 bool DownloadRequestInfoBarDelegate::Accept() {
   if (host_) {
     // Accept() call will nullify host_ if no further prompts are required.
     host_->Accept();
   }
 
   return !host_;
 }