MD Downloads: remove unused event parameter to fix closure compile

chrome/browser/resources/md_downloads/crisper.js

Index: chrome/browser/resources/md_downloads/crisper.js
diff --git a/chrome/browser/resources/md_downloads/crisper.js b/chrome/browser/resources/md_downloads/crisper.js
index c2babd5e2d133eebb712ec59af837f16b4d46472..1ceeb07e93ee6b9af698db348adb6f4a44282578 100644
--- a/chrome/browser/resources/md_downloads/crisper.js
+++ b/chrome/browser/resources/md_downloads/crisper.js
@@ -17055,11 +17055,8 @@ cr.define('downloads', function() {
         downloads.ActionService.getInstance().undo();
     },
 
-    /**
-     * @param {Event} e
-     * @private
-     */
-    onListScroll_: function(e) {
+    /** @private */
+    onListScroll_: function() {
       var list = this.$['downloads-list'];
       if (list.scrollHeight - list.scrollTop - list.offsetHeight <= 100) {
         // Approaching the end of the scrollback. Attempt to load more items.