Remove dead code from hmt#delete. Closes #11236 [rubyruy]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@8932 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/lib/active_record/associations/has_many_through_association.rb

@@ -83,7 +83,7 @@ def delete(*records)
             raise_on_type_mismatch(associate)
             raise ActiveRecord::HasManyThroughCantDissociateNewRecords.new(@owner, through) unless associate.respond_to?(:new_record?) && !associate.new_record?
 
-            @owner.send(through.name).proxy_target.delete(klass.delete_all(construct_join_attributes(associate)))
+            klass.delete_all(construct_join_attributes(associate))
             @target.delete(associate)
           end
         end

activerecord/test/cases/associations/join_model_test.rb

@@ -505,11 +505,13 @@ def test_delete_associate_when_deleting_from_has_many_through
     tag = Tag.create!(:name => 'doomed')
     post_thinking = posts(:thinking)
     post_thinking.tags << tag
+    assert_equal(count + 1, post_thinking.taggings(true).size)
     assert_equal(count + 1, post_thinking.tags(true).size)
 
     assert_nothing_raised { post_thinking.tags.delete(tag) }
     assert_equal(count, post_thinking.tags.size)
     assert_equal(count, post_thinking.tags(true).size)
+    assert_equal(count, post_thinking.taggings(true).size)
     assert_equal(tags_before.sort, post_thinking.tags.sort)
   end