MD Downloads: rework "more actions" menu focus handling code

chrome/browser/resources/md_downloads/vulcanized.html

Index: chrome/browser/resources/md_downloads/vulcanized.html
diff --git a/chrome/browser/resources/md_downloads/vulcanized.html b/chrome/browser/resources/md_downloads/vulcanized.html
index 61a036923653222840b20d0bde216bb80c8fed08..5c039585445759e7846e952e86f933206838fea5 100644
--- a/chrome/browser/resources/md_downloads/vulcanized.html
+++ b/chrome/browser/resources/md_downloads/vulcanized.html
@@ -2650,10 +2650,10 @@ paper-button {
       <paper-menu-button id="more" horizontal-align="[[overflowAlign_]]">
         <paper-icon-button icon="cr:more-vert" title="$i18n{moreActions}" class="dropdown-trigger"></paper-icon-button>
         <paper-menu class="dropdown-content">
-          <paper-item class="clear-all" on-tap="onClearAllTap_">
+          <paper-item class="clear-all" on-tap="onClearAllTap_" on-blur="onItemBlur_">
             $i18n{clearAll}
           </paper-item>
-          <paper-item on-tap="onOpenDownloadsFolderTap_">
+          <paper-item on-tap="onOpenDownloadsFolderTap_" on-blur="onItemBlur_">
             $i18n{openDownloadsFolder}
           </paper-item>
         </paper-menu>