Do not normalize into NFC the values of form fields

Source/wtf/text/TextCodec.h

Index: Source/wtf/text/TextCodec.h
diff --git a/Source/wtf/text/TextCodec.h b/Source/wtf/text/TextCodec.h
index 0190757a7f6fe18489c832763aa842b7307e8eea..1145f4fe935d59decb056808c886df8ada5b17c4 100644
--- a/Source/wtf/text/TextCodec.h
+++ b/Source/wtf/text/TextCodec.h
@@ -39,6 +39,15 @@ namespace WTF {
 
 class TextEncoding;
 
+// Which normalization algorithm to apply.
+enum NormalizationMode {
+    // No normalization is performed.
+    NoNormalization,
+
+    // Apply Unicode NFC normalization.
+    NFCNormalization
+};
+
 // Specifies what will happen when a character is encountered that is
 // not encodable in the character set.
 enum UnencodableHandling {