Update appearance of read Ash notifications.

Also fixes the logic for the unread count and refresh layout for displayed notification.

BUG=137155

Review URL: https://chromiumcodereview.appspot.com/10852007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@149922 0039d316-1c4b-4281-b951-d872f2087c98

ash/system/web_notification/web_notification_tray.h

@@ -152,7 +152,6 @@ class ASH_EXPORT WebNotificationTray : public internal::TrayBackgroundView {
   views::Label* count_label_;
   Delegate* delegate_;
   bool show_message_center_on_unlock_;
-  int unread_count_;
 
   DISALLOW_COPY_AND_ASSIGN(WebNotificationTray);
 };