Remove createCDATASection from benchmarks

It has been removed from the HTML spec and chrome no longer supports it

Author: Joris-van-der-Wel

benchmark/dom/construction.js

@@ -28,7 +28,3 @@ exports.createEvent = suite(document => {
 exports.createProcessingInstruction = suite(document => {
   document.createProcessingInstruction("php", "echo 123; ?");
 });
-
-exports.createCDATASection = suite(document => {
-  document.createCDATASection("foo");
-});