Do not normalize into NFC the data sent by XMLHttpRequest

Source/core/xml/XMLHttpRequest.cpp

Index: Source/core/xml/XMLHttpRequest.cpp
diff --git a/Source/core/xml/XMLHttpRequest.cpp b/Source/core/xml/XMLHttpRequest.cpp
index f7438cb521b934216d745d5a403f4bfe8d6eb190..d00002b4b28e30e4c541a0e4a32b2d466fdb4d8e 100644
--- a/Source/core/xml/XMLHttpRequest.cpp
+++ b/Source/core/xml/XMLHttpRequest.cpp
@@ -585,7 +585,7 @@ void XMLHttpRequest::send(Document* document, ExceptionState& es)
         String body = createMarkup(document);
 
         // FIXME: This should use value of document.inputEncoding to determine the encoding to use.
-        m_requestEntityBody = FormData::create(UTF8Encoding().normalizeAndEncode(body, WTF::EntitiesForUnencodables));
+        m_requestEntityBody = FormData::create(UTF8Encoding().encode(body, WTF::EntitiesForUnencodables));
         if (m_upload)
             m_requestEntityBody->setAlwaysStream(true);
     }
@@ -607,7 +607,7 @@ void XMLHttpRequest::send(const String& body, ExceptionState& es)
             m_requestHeaders.set("Content-Type", contentType);
         }
 
-        m_requestEntityBody = FormData::create(UTF8Encoding().normalizeAndEncode(body, WTF::EntitiesForUnencodables));
+        m_requestEntityBody = FormData::create(UTF8Encoding().encode(body, WTF::EntitiesForUnencodables));
         if (m_upload)
             m_requestEntityBody->setAlwaysStream(true);
     }