MD History: Fix display of 'No history entries found' message

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 f37ea4e5206e83c047f295d526d53cf82b8bb779..41b2382f794e0e987605b038ef786893e75f8acf 100644
--- a/chrome/test/data/webui/md_history/history_list_test.js
+++ b/chrome/test/data/webui/md_history/history_list_test.js
@@ -223,6 +223,7 @@ suite('<history-list>', function() {
 
     return PolymerTest.flushTasks().then(function() {
       assertFalse(element.$['no-results'].hidden);
+      assertNotEquals('', element.$['no-results'].textContent.trim());
       assertTrue(element.$['infinite-list'].hidden);
 
       app.historyResult(createHistoryInfo(), TEST_HISTORY_RESULTS);