Remove unused method.

app/models/user.rb

@@ -1048,12 +1048,6 @@ class User < ActiveRecord::Base
     end.to_i
   end
 
-  def update_cache_counts
-    assigned_open_merge_requests_count(force: true)
-    assigned_open_issues_count(force: true)
-    personal_projects_count(force: true)
-  end
-
   def update_todos_count_cache
     todos_done_count(force: true)
     todos_pending_count(force: true)