Do not normalize into NFC the values of form fields

Source/wtf/text/TextEncoding.h

Index: Source/wtf/text/TextEncoding.h
diff --git a/Source/wtf/text/TextEncoding.h b/Source/wtf/text/TextEncoding.h
index ed77021a59529f148472a28ffdba977852efd6e1..a3a7d88b0f7d88519bab91dd07f977acc00d1159 100644
--- a/Source/wtf/text/TextEncoding.h
+++ b/Source/wtf/text/TextEncoding.h
@@ -73,8 +73,13 @@ public:
         return decode(str, length, false, ignored);
     }
     String decode(const char*, size_t length, bool stopOnError, bool& sawError) const;
+
+    // Encodes the string, but does *not* normalize first.
     CString encode(const String&, UnencodableHandling) const;
 
+    // Applies Unicode NFC normalization, then encodes the normalized string.
+    CString normalizeAndEncode(const String&, UnencodableHandling) const;
+
     UChar backslashAsCurrencySymbol() const;
 
 private: