[MD History] Make sidebar menu respond to spacebar.

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

Index: chrome/test/data/webui/md_history/history_routing_test.js
diff --git a/chrome/test/data/webui/md_history/history_routing_test.js b/chrome/test/data/webui/md_history/history_routing_test.js
index adf84ccae6c7122a3dafb4d3c4c17267fbf750a3..b7ffb7df1286dee194c1ed005fed90d23975cbbe 100644
--- a/chrome/test/data/webui/md_history/history_routing_test.js
+++ b/chrome/test/data/webui/md_history/history_routing_test.js
@@ -33,7 +33,7 @@ cr.define('md_history.history_routing_test', function() {
         assertEquals('syncedTabs', app.routeData_.page);
         assertEquals('chrome://history/syncedTabs', window.location.href);
 
-        MockInteractions.tap(menu.children[0]);
+        MockInteractions.keyDownOn(menu.children[0], 32, '', "Space");
         assertEquals('', app.routeData_.page);
         assertEquals('chrome://history/', window.location.href);
       });