Files.app: Updated CSS to remove white border lines from the default action dialog.

chrome/browser/resources/file_manager/css/file_manager.css

Index: chrome/browser/resources/file_manager/css/file_manager.css
diff --git a/chrome/browser/resources/file_manager/css/file_manager.css b/chrome/browser/resources/file_manager/css/file_manager.css
index f4799bf7079ecaea8699299232dc63f77d51ad15..68e53566d102ffeb507a43724ef9ba0627cb7ed6 100644
--- a/chrome/browser/resources/file_manager/css/file_manager.css
+++ b/chrome/browser/resources/file_manager/css/file_manager.css
@@ -1712,6 +1712,10 @@ body[new-ui] #list-container li.table-row {
   height: 30px;
 }
 
+body[new-ui] #default-actions-list li {
+  border-style: none;
+}
+
 /* The icon in the name column. See file_types.css for specific icons. */
 .detail-icon {
   height: 24px;