MD Settings: Adjust <select> focus color and bottom border radius.

chrome/browser/resources/settings/md_select_css.html

Index: chrome/browser/resources/settings/md_select_css.html
diff --git a/chrome/browser/resources/settings/md_select_css.html b/chrome/browser/resources/settings/md_select_css.html
index 28e235dcd1948a9e8ea0c3a3491169fda576a47f..2a28fc246293ed6ab3fb2ec5b7800f026fac61e6 100644
--- a/chrome/browser/resources/settings/md_select_css.html
+++ b/chrome/browser/resources/settings/md_select_css.html
@@ -9,6 +9,8 @@
         background-size: 0.9em;
         border-bottom: 1px solid var(--paper-grey-300);
         border-left: none;
+        /* Override Mac's default border-radius */
+        border-radius: 0;
         border-right: none;
         border-top: none;
         color: var(--primary-text-color);
@@ -25,7 +27,7 @@
       }
 
       .md-select-underline {
-        border-top: 2px solid var(--paper-indigo-500);
+        border-top: 2px solid var(--google-blue-500);
         display: block;
         position: relative;
         top: -1px;