MD Downloads: change :focus effect to underline so it doesn't look like :hover

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..1e7ceae35ecfd922bf1762b7de86040bde34d701 100644
--- a/chrome/browser/resources/md_downloads/vulcanized.html
+++ b/chrome/browser/resources/md_downloads/vulcanized.html
@@ -2589,7 +2589,16 @@ paper-icon-button {
   -webkit-margin-start: 16px;
 }
 
+:host {
+  /* Applies to <paper-item>, hell if I know why it has to be here. */
+  --dark-divider-opacity: 0;
+}
+
 paper-item {
+  --paper-item-focused: {
+    background: none;
+    text-decoration: underline;
+  };
   -webkit-user-select: none;
   cursor: pointer;
   font: inherit;