Revert of Update XMLHttpRequest forbidden header names.

LayoutTests/http/tests/xmlhttprequest/set-dangerous-headers.html

Index: LayoutTests/http/tests/xmlhttprequest/set-dangerous-headers.html
diff --git a/LayoutTests/http/tests/xmlhttprequest/set-dangerous-headers.html b/LayoutTests/http/tests/xmlhttprequest/set-dangerous-headers.html
index 6427b15c77369f0a348d0aa12f4caa1f678a9302..7692af9a309b4b3a6811b6b5a147a65e8d6ad78a 100644
--- a/LayoutTests/http/tests/xmlhttprequest/set-dangerous-headers.html
+++ b/LayoutTests/http/tests/xmlhttprequest/set-dangerous-headers.html
@@ -20,10 +20,10 @@
     req.setRequestHeader("AUTHORIZATION", "baz");
     req.setRequestHeader("CONNECTION", "foobar");
     req.setRequestHeader("CONTENT-LENGTH", "123456");
+    req.setRequestHeader("CONTENT-TRANSFER-ENCODING", "foobar");
     req.setRequestHeader("COOKIE", "foobar");
     req.setRequestHeader("COOKIE2", "foobar");
     req.setRequestHeader("DATE", "foobar");
-    req.setRequestHeader("DNT", "foobar");
     req.setRequestHeader("EXPECT", "100-continue");
     req.setRequestHeader("HOST", "foobar");
     req.setRequestHeader("KEEP-ALIVE", "foobar");