Reduce method names converted to upper case via uppercaseKnownHTTPMethod()

LayoutTests/http/tests/xmlhttprequest/method-names-expected.txt

+Test that open() converts only special request methods to uppercase, per http://xhr.spec.whatwg.org/#dom-xmlhttprequest-open
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+Known methods to be converted to upper-case
+PASS req.getResponseHeader('x-request-method') is "DELETE"
+PASS req.responseText is "DELETE"
+PASS req.getResponseHeader('x-request-method') is "GET"
+PASS req.responseText is "GET"
+PASS req.getResponseHeader('x-request-method') is "HEAD"
+PASS req.getResponseHeader('x-request-method') is "OPTIONS"
+PASS req.responseText is "OPTIONS"
+PASS req.getResponseHeader('x-request-method') is "POST"
+PASS req.responseText is "POST"
+PASS req.getResponseHeader('x-request-method') is "PUT"
+PASS req.responseText is "PUT"
+Other methods should be sent as-is
+PASS req.getResponseHeader('x-request-method') is "pAtCH"
+PASS req.responseText is "pAtCH"
+PASS req.getResponseHeader('x-request-method') is "XuniCORn"
+PASS req.responseText is "XuniCORn"
+PASS req.getResponseHeader('x-request-method') is "LOck"
+PASS req.responseText is "LOck"
+PASS req.getResponseHeader('x-request-method') is "LOck"
+PASS req.responseText is "LOck"
+PASS req.getResponseHeader('x-request-method') is "unLOCK"
+PASS req.responseText is "unLOCK"
+PASS req.getResponseHeader('x-request-method') is "m-post"
+PASS req.responseText is "m-post"
+PASS req.getResponseHeader('x-request-method') is "iNdex"
+PASS req.responseText is "iNdex"
+PASS successfullyParsed is true
+
+TEST COMPLETE
+