DEV: Remove unused method.

app/mailers/user_notifications.rb

@@ -199,8 +199,8 @@ class UserNotifications < ActionMailer::Base
       end
 
       # Try to find 3 interesting stats for the top of the digest
+      new_topics_count = Topic.for_digest(user, min_date).count
 
-      new_topics_count = Topic.new_since_last_seen(user, min_date).count
       if new_topics_count == 0
         # We used topics from new users instead, so count should match
         new_topics_count = topics_for_digest.size

app/models/topic.rb

@@ -423,12 +423,6 @@ class Topic < ActiveRecord::Base
     topics
   end
 
-  # Using the digest query, figure out what's  new for a user since last seen
-  def self.new_since_last_seen(user, since, featured_topic_ids = nil)
-    topics = Topic.for_digest(user, since)
-    featured_topic_ids ? topics.where("topics.id NOT IN (?)", featured_topic_ids) : topics
-  end
-
   def meta_data=(data)
     custom_fields.replace(data)
   end