Add notification title back to ChromeOS.

ui/message_center/views/message_center_bubble.cc

Index: ui/message_center/views/message_center_bubble.cc
diff --git a/ui/message_center/views/message_center_bubble.cc b/ui/message_center/views/message_center_bubble.cc
index c210cdcfb29dc4bb2fd6e967936a9ae50c42adf1..ed93d7fa0c8c26cdeedffca91ac4242b3f82ed9b 100644
--- a/ui/message_center/views/message_center_bubble.cc
+++ b/ui/message_center/views/message_center_bubble.cc
@@ -4,6 +4,8 @@
 
 #include "ui/message_center/views/message_center_bubble.h"
 
+#include "grit/ui_strings.h"
+#include "ui/base/l10n/l10n_util.h"
 #include "ui/message_center/message_center_style.h"
 #include "ui/message_center/views/message_center_view.h"
 #include "ui/views/layout/fill_layout.h"
@@ -62,7 +64,8 @@ MessageCenterBubble::MessageCenterBubble(MessageCenter* message_center,
     : MessageBubbleBase(message_center, tray),
       message_center_view_(NULL),
       initially_settings_visible_(false),
-      first_item_has_no_margin_(first_item_has_no_margin) {
+      first_item_has_no_margin_(first_item_has_no_margin),
+      title_(l10n_util::GetStringUTF16(IDS_MESSAGE_CENTER_FOOTER_TITLE)) {
 }
 
 MessageCenterBubble::~MessageCenterBubble() {