Disable MaterialHistoryBrowserTest.SyncedTabsTest

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

Index: chrome/test/data/webui/md_history/md_history_browsertest.js
diff --git a/chrome/test/data/webui/md_history/md_history_browsertest.js b/chrome/test/data/webui/md_history/md_history_browsertest.js
index c7bf5f3dcd1cbffc33e38215ca0d90326e63ab62..bbef89f9e2da1adfdebc83545523ea289942ad65 100644
--- a/chrome/test/data/webui/md_history/md_history_browsertest.js
+++ b/chrome/test/data/webui/md_history/md_history_browsertest.js
@@ -117,7 +117,8 @@ TEST_F('MaterialHistoryBrowserTest', 'RoutingTest', function() {
   mocha.run();
 });
 
-TEST_F('MaterialHistoryBrowserTest', 'SyncedTabsTest', function() {
+// Fails on Mac, http://crbug.com/640862
+TEST_F('MaterialHistoryBrowserTest', 'DISABLED_SyncedTabsTest', function() {
   md_history.history_synced_tabs_test.registerTests();
   mocha.run();
 });