[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 f54c605f1a00aeb3628fbd09b6c57c54f5bc685c..a0d776c7d5f5f9795a31fb767ced0c34cd71997d 100644
--- a/chrome/test/data/webui/md_history/history_list_test.js
+++ b/chrome/test/data/webui/md_history/history_list_test.js
@@ -188,7 +188,7 @@ cr.define('md_history.history_list_test', function() {
 
           MockInteractions.tap(items[2].$['menu-button']);
           assertTrue(sharedMenu.menuOpen);
-          element.$['infinite-list'].scrollTop = 100;
+          element.scrollTop = 100;
           return flush();
         }).then(function() {
           assertFalse(sharedMenu.menuOpen);