html: remove unnecessary namespace checking

Change-Id: I03ebb4369389262b842001e18d0594fd71b19f44
Reviewed-on: https://go-review.googlesource.com/c/138797
Run-TryBot: Kunpei Sakai <namusyaka@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Nigel Tao <nigeltao@golang.org>

html/parse.go

@@ -1264,12 +1264,6 @@ func (p *parser) inBodyEndTagFormatting(tagAtom a.Atom) {
 		switch commonAncestor.DataAtom {
 		case a.Table, a.Tbody, a.Tfoot, a.Thead, a.Tr:
 			p.fosterParent(lastNode)
-		case a.Template:
-			// TODO: remove namespace checking
-			if commonAncestor.Namespace == "html" {
-				commonAncestor = commonAncestor.LastChild
-			}
-			fallthrough
 		default:
 			commonAncestor.AppendChild(lastNode)
 		}