Remove AssociationProxy#dependent? - it's badly named and only used in one place

activerecord/lib/active_record/associations/association_proxy.rb

@@ -167,11 +167,6 @@ def send(method, *args)
       end
 
       protected
-        # Does the association have a <tt>:dependent</tt> option?
-        def dependent?
-          @reflection.options[:dependent]
-        end
-
         def interpolate_sql(sql, record = nil)
           @owner.send(:interpolate_sql, sql, record)
         end

activerecord/lib/active_record/associations/has_one_association.rb

@@ -27,7 +27,7 @@ def replace(obj, dont_save = false)
         load_target
 
         unless @target.nil? || @target == obj
-          if dependent? && !dont_save
+          if @reflection.options[:dependent] && !dont_save
             case @reflection.options[:dependent]
             when :delete
               @target.delete if @target.persisted?