Downloads: fix x-button spacing

Bug: 842908
Change-Id: I0487199b47488c741ca360f5c462ac46fcb8b487
Reviewed-on: https://chromium-review.googlesource.com/1149067Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Commit-Queue: Scott Chen <scottchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577749}

chrome/browser/resources/md_downloads/item.html

@@ -203,10 +203,12 @@
       }
 
       #remove-wrapper > paper-icon-button-light {
+        --cr-icon-size: 16px;
         color: var(--google-grey-refresh-700);
         height: 32px;
-        margin-inline-end: 0;
+        margin-inline-end: 8px;
         margin-inline-start: 0;
+        margin-top: 8px;
         width: 32px;
       }