Tests console message when script is loaded with incorrect text/html mime type.
Bug 69972
-Resource interpreted as Script but transferred with MIME type text/plain: "http://127.0.0.1:8000/inspector/network/resources/script-as-text.php". script-as-text-loading.html:10
+script-as-text-loading.html:10 Resource interpreted as Script but transferred with MIME type text/plain: "http://127.0.0.1:8000/inspector/network/resources/script-as-text.php".