[MD settings] apply dropdown settings to iron-dropdown

chrome/browser/resources/settings/settings_shared_css.html

Index: chrome/browser/resources/settings/settings_shared_css.html
diff --git a/chrome/browser/resources/settings/settings_shared_css.html b/chrome/browser/resources/settings/settings_shared_css.html
index 651088352dd5d398c7aedb39ba434152c1ae31b8..41fadea97b594a8399d9c377a2c879aca49a45d9 100644
--- a/chrome/browser/resources/settings/settings_shared_css.html
+++ b/chrome/browser/resources/settings/settings_shared_css.html
@@ -41,6 +41,7 @@
         };
       }
 
+      iron-dropdown .dropdown-content,
       paper-dropdown-menu paper-listbox {
         min-width: 128px;
         padding: 8px 0;
@@ -48,7 +49,6 @@
 
       iron-dropdown .dropdown-item,
       paper-dropdown-menu .dropdown-item {
-        -webkit-padding-start: 24px;
         align-items: center;
         background: none;
         border: none;
@@ -56,6 +56,7 @@
         display: flex;
         font: inherit;
         min-height: 32px;
+        padding: 0 24px;
         text-align: start;
         width: 100%;
       }