Transition from tables to divs for the message list.

This breaks our casperjs tests.

(imported from commit c63181c73a24eed4a80bfa56966d1f0871c5edb2)

static/js/rows.js

@@ -56,7 +56,7 @@ exports.get_closest_row = function (element) {
     // This gets the closest message row to an element, whether it's
     // a summary bar, recipient bar, or message.  With our current markup,
     // this is the most reliable way to do it.
-    return $(element).closest("tr");
+    return $(element).closest(".message_row");
 };
 
 return exports;