Don't NFC normalize filenames in form data

Source/platform/network/FormDataBuilder.cpp

Index: Source/platform/network/FormDataBuilder.cpp
diff --git a/Source/platform/network/FormDataBuilder.cpp b/Source/platform/network/FormDataBuilder.cpp
index 196ca0082359a3950b0bf511c60ba1e86476d72d..e0125ffa39f410147c34b33931d8186e6b6225f0 100644
--- a/Source/platform/network/FormDataBuilder.cpp
+++ b/Source/platform/network/FormDataBuilder.cpp
@@ -168,7 +168,7 @@ void FormDataBuilder::addFilenameToMultiPartHeader(Vector<char>& buffer, const W
     // 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.normalizeAndEncode(filename, WTF::QuestionMarksForUnencodables));
+    appendQuotedString(buffer, encoding.encode(filename, WTF::QuestionMarksForUnencodables));
     append(buffer, '"');
 }