Use native implementation of dangerous download infobar

chrome/browser/android/download/dangerous_download_infobar_delegate.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/android/download/dangerous_download_infobar_delegate.h"
+
+#include <memory>
+
+#include "base/strings/utf_string_conversions.h"
+#include "chrome/browser/android/android_theme_resources.h"
+#include "chrome/browser/infobars/infobar_service.h"
+#include "chrome/grit/generated_resources.h"
+#include "components/infobars/core/infobar.h"
+#include "ui/base/l10n/l10n_util.h"
+
+// static
+void DangerousDownloadInfoBarDelegate::Create(
+    InfoBarService* infobar_service,
+    content::DownloadItem* download_item) {
+  infobar_service->AddInfoBar(infobar_service->CreateConfirmInfoBar(
+      std::unique_ptr<ConfirmInfoBarDelegate>(
+          new DangerousDownloadInfoBarDelegate(download_item))));
+}
+
+DangerousDownloadInfoBarDelegate::DangerousDownloadInfoBarDelegate(
+    content::DownloadItem* download_item)
+    : download_item_(download_item) {
+  download_item_->AddObserver(this);
+}
+
+DangerousDownloadInfoBarDelegate::~DangerousDownloadInfoBarDelegate() {
+  if (download_item_)
+    download_item_->RemoveObserver(this);
+}
+
+void DangerousDownloadInfoBarDelegate::OnDownloadDestroyed(
+    content::DownloadItem* download_item) {
+  DCHECK_EQ(download_item, download_item_);
+  download_item_ = nullptr;
+}
+
+infobars::InfoBarDelegate::InfoBarIdentifier
+DangerousDownloadInfoBarDelegate::GetIdentifier() const {
+  return CONFIRM_DANGEROUS_DOWNLOAD;
+}
+
+int DangerousDownloadInfoBarDelegate::GetIconId() const {
+  return IDR_ANDROID_INFOBAR_WARNING;
+}
+
+bool DangerousDownloadInfoBarDelegate::ShouldExpire(
+    const NavigationDetails& details) const {
+  return false;
+}
+
+void DangerousDownloadInfoBarDelegate::InfoBarDismissed() {
+  if (download_item_)
+    download_item_->Remove();
+}
+
+base::string16 DangerousDownloadInfoBarDelegate::GetMessageText() const {
+  return l10n_util::GetStringFUTF16(
+      IDS_PROMPT_DANGEROUS_DOWNLOAD,
+      base::UTF8ToUTF16(download_item_->GetFileNameToReportUser().value()));
+}
+
+bool DangerousDownloadInfoBarDelegate::Accept() {
+  if (download_item_)
+    download_item_->ValidateDangerousDownload();
+  return true;
+}
+
+bool DangerousDownloadInfoBarDelegate::Cancel() {
+  if (download_item_)
+    download_item_->Remove();
+  return true;
+}