implementation for new duplicate download UI

chrome/browser/android/download/duplicate_download_infobar_delegate.cc

Index: chrome/browser/android/download/duplicate_download_infobar_delegate.cc
diff --git a/chrome/browser/android/download/duplicate_download_infobar_delegate.cc b/chrome/browser/android/download/duplicate_download_infobar_delegate.cc
new file mode 100644
index 0000000000000000000000000000000000000000..f21aa5d3b15f6f6a6160904f6a7ab4dbd61178e5
--- /dev/null
+++ b/chrome/browser/android/download/duplicate_download_infobar_delegate.cc
@@ -0,0 +1,24 @@
+// 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();
+}
+
+}  // namespace android
+}  // namespace chrome