ChromeOS OOBE: switch from iron-dropdown to <select>.

ui/webui/resources/html/md_select_css.html

Index: ui/webui/resources/html/md_select_css.html
diff --git a/chrome/browser/resources/settings/md_select_css.html b/ui/webui/resources/html/md_select_css.html
similarity index 88%
rename from chrome/browser/resources/settings/md_select_css.html
rename to ui/webui/resources/html/md_select_css.html
index 2e1768f803097039da5194858cd9735eace85f80..92ea60a99df18567e30811fc6e4ff1eb9195423f 100644
--- a/chrome/browser/resources/settings/md_select_css.html
+++ b/ui/webui/resources/html/md_select_css.html
@@ -1,4 +1,5 @@
-<link rel="import" href="/settings_vars_css.html">
+<link rel="import" href="chrome://resources/html/polymer.html">
+<link rel="import" href="chrome://resources/polymer/v1_0/paper-styles/color.html">
 
 <dom-module id="md-select">
   <template>
@@ -8,7 +9,7 @@
         -webkit-appearance: none;
         /* Ensure that the text does not overlap with the down arrow. */
         -webkit-padding-end: calc(var(--md-arrow-width) * 1.8);
-        background: url(images/arrow_down.svg) 97% center no-repeat;
+        background: url(../images/arrow_down.svg) 97% center no-repeat;
         background-size: var(--md-arrow-width);
         border-bottom: 1px solid var(--paper-grey-300);
         border-left: none;