Downloads: fix incognito icon alignment

Bug: 880737
Change-Id: I2c455762066d424a3cde4e91dc70eacfc1b4fb7c
Reviewed-on: https://chromium-review.googlesource.com/1217033Reviewed-by: Esmael El-Moslimany <aee@chromium.org>
Commit-Queue: Scott Chen <scottchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590519}

chrome/browser/resources/md_downloads/item.html

@@ -217,7 +217,12 @@
             url(chrome://downloads/1x/incognito_marker.png) 1x,
             url(chrome://downloads/2x/incognito_marker.png) 2x);
         position: absolute;
-        right: 10px;
+        right: 16px;
+      }
+
+      :host-context([dir='rtl']) #incognito {
+        left: 16px;
+        right: initial;
       }
     </style>