implementation for new duplicate download UI

chrome/browser/android/download/duplicate_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/duplicate_download_infobar_delegate.h"
+
+namespace chrome {
+namespace android {
+
+bool DuplicateDownloadInfoBarDelegate::ShouldExpire(
+    const NavigationDetails& details) const {
+  return false;
+}
+
+bool DuplicateDownloadInfoBarDelegate::IsOfflinePage() const {
+  return false;
+}
+
+std::string DuplicateDownloadInfoBarDelegate::GetPageURL() const {
+  return std::string();
+}
+
+base::string16 DuplicateDownloadInfoBarDelegate::GetMessageText() const {
+  return base::string16();
+}
+
+bool DuplicateDownloadInfoBarDelegate::IsOffTheRecord() const {
+  return false;
+}
+
+}  // namespace android
+}  // namespace chrome