Make cr.ui.Focus* play nice with Shadow DOM and MD chrome://downloads

chrome/browser/resources/md_downloads/shared_style.css

Index: chrome/browser/resources/md_downloads/shared_style.css
diff --git a/chrome/browser/resources/md_downloads/shared_style.css b/chrome/browser/resources/md_downloads/shared_style.css
index dd1f6ea5ac92f5c062babb0409eb93ac320d5b55..b997d6397859d589bc10f8a4bc0da41eb533fe86 100644
--- a/chrome/browser/resources/md_downloads/shared_style.css
+++ b/chrome/browser/resources/md_downloads/shared_style.css
@@ -10,6 +10,15 @@
   --downloads-side-column-basis: 201px;
 }
 
-cr-button:not([lowercase]) {
+paper-button {
+  margin: 0;
+  min-width: auto;
+}
+
+paper-button[lowercase] {
+  text-transform: none;
+}
+
+paper-button:not([lowercase]) {
   font-weight: 500;
 }