MD Settings: Fix some tests that break when run in Vulcanized mode.

chrome/test/data/webui/settings/rtl_tests.js

Index: chrome/test/data/webui/settings/rtl_tests.js
diff --git a/chrome/test/data/webui/settings/rtl_tests.js b/chrome/test/data/webui/settings/rtl_tests.js
index be4e9bafd95f21858ea545ce628e3b9f8a816718..49bb73359ad2f073fb419d98a2a462d26de5376e 100644
--- a/chrome/test/data/webui/settings/rtl_tests.js
+++ b/chrome/test/data/webui/settings/rtl_tests.js
@@ -11,6 +11,10 @@ cr.define('settings_rtl_tests', function() {
 
   function registerDrawerPanelTests() {
     suite('settings drawer panel RTL tests', function() {
+      setup(function() {
+        PolymerTest.clearBody();
+      });
+
       test('test i18n processing flips drawer panel', function() {
         var ui = document.createElement('settings-ui');
         var appDrawer = ui.$.drawer;