Do not normalize into NFC the values of form fields

Source/core/platform/network/FormDataBuilder.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 144 matching lines @@
         append(buffer, "--");
 
     append(buffer, "\r\n");
 }
 
 void FormDataBuilder::addFilenameToMultiPartHeader(Vector<char>& buffer, const WTF::TextEncoding& encoding, const String& filename)
 {
     // FIXME: This loses data irreversibly if the filename includes characters you can't encode
     // in the website's character set.
     append(buffer, "; filename=\"");
-    appendQuotedString(buffer, encoding.encode(filename, WTF::QuestionMarksForUnencodables));
+    appendQuotedString(buffer, encoding.normalizeAndEncode(filename, WTF::QuestionMarksForUnencodables));
     append(buffer, '"');
 }
 
 void FormDataBuilder::addContentTypeToMultiPartHeader(Vector<char>& buffer, const CString& mimeType)
 {
     append(buffer, "\r\nContent-Type: ");
     append(buffer, mimeType);
 }
 
 void FormDataBuilder::finishMultiPartHeader(Vector<char>& buffer)
@@ skipping 35 matching lines @@
         else if (c == '\n' || (c == '\r' && (i + 1 >= length || string.data()[i + 1] != '\n')))
             append(buffer, "%0D%0A");
         else if (c != '\r') {
             append(buffer, '%');
             appendByteAsHex(c, buffer);
         }
     }
 }
 
 }