MD Downloads: fix clear all keyboard shortcut on Mac

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 270d4d29eb2c4ea2f9e86da47b0cb380cadc938d..cf866b173dead07a10bcffa6d8412737181847c5 100644
--- a/chrome/browser/resources/md_downloads/crisper.js
+++ b/chrome/browser/resources/md_downloads/crisper.js
@@ -10572,6 +10572,11 @@ var CrSearchFieldBehavior = {
   toggleShowingSearch_: function() {
     this.showingSearch = !this.showingSearch;
   },
+
+  /** @return {boolean} */
+  isSearchFocused: function() {
+    return this.$.searchTerm.focused;
+  }
 };
 (function() {
       'use strict';