[MD History] Use proper shadows for cards.

chrome/test/data/webui/md_history/history_list_test.js

Index: chrome/test/data/webui/md_history/history_list_test.js
diff --git a/chrome/test/data/webui/md_history/history_list_test.js b/chrome/test/data/webui/md_history/history_list_test.js
index 3cfff5a3afc748adc5e21f5c0a486eeb2165baad..8de9f9a552a98dc72ec60ef39b948c0e87ea17cf 100644
--- a/chrome/test/data/webui/md_history/history_list_test.js
+++ b/chrome/test/data/webui/md_history/history_list_test.js
@@ -185,8 +185,8 @@ cr.define('md_history.history_list_test', function() {
 
           MockInteractions.tap(items[2].$['menu-button']);
           assertTrue(sharedMenu.menuOpen);
-          element.$['infinite-list'].scrollTop = 100;
-          return flush();
+          element.$['infinite-list'].scrollToIndex(20);
+          return waitForEvent(sharedMenu, 'menu-open-changed');
         }).then(function() {
           assertFalse(sharedMenu.menuOpen);
         });