Show the Data Saver string for offline previews when Data Saver is enabled

chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_io_data.cc

Index: chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_io_data.cc
diff --git a/chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_io_data.cc b/chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_io_data.cc
index 17be700ecddff935f0924a272fa7db8a7d1853a7..009b8c82354354445920c53df0ef33ec470729b3 100644
--- a/chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_io_data.cc
+++ b/chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_io_data.cc
@@ -42,6 +42,7 @@ void OnLoFiResponseReceivedOnUI(content::WebContents* web_contents) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   PreviewsInfoBarDelegate::Create(
       web_contents, PreviewsInfoBarDelegate::LOFI,
+      true /* is_data_saver_user */,
       PreviewsInfoBarDelegate::OnDismissPreviewsInfobarCallback());
 }