MD Downloads: remove bold selected item style

chrome/browser/resources/md_downloads/toolbar.css

 /* Copyright 2015 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file. */
 
 :host {
   align-items: center;
   background: var(--md-toolbar-color);
   color: white;
   content-sizing: padding-box;
   display: flex;
@@ skipping 65 matching lines @@
   };
 }
 
 #more {
   --paper-menu-button: {
     padding: 0;
   };
   -webkit-margin-start: 16px;
 }
 
+paper-menu {
+  --paper-menu-selected-item: {
+    font-weight: normal;
+  };
+}
+
 paper-item {
   -webkit-user-select: none;
   cursor: pointer;
   font: inherit;
   min-height: 40px;
 }
 
 @media not all and (max-width: 1024px) {
   /* Hide vertical dot menu when there's enough room for #actions. */
   paper-menu-button {
     display: none;
   }
 }
 
 @media all and (max-width: 1024px) {
   /* Hide #actions for narrow windows; they're shown in a vertical dot menu. */
   #actions {
     display: none;
   }
 }