Prevent direct use of "replacement" text encoding.

Source/wtf/text/TextEncodingRegistry.cpp

 /*
  * Copyright (C) 2006, 2007, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2007-2009 Torch Mobile, Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 251 matching lines @@
     // Shift_JIS_X0213-2000 is not the same encoding as Shift_JIS on Mac. We need to register both of them.
     addEncodingName(nonBackslashEncodings, "Shift_JIS");
     addEncodingName(nonBackslashEncodings, "Shift_JIS_X0213-2000");
 }
 
 bool isJapaneseEncoding(const char* canonicalEncodingName)
 {
     return canonicalEncodingName && japaneseEncodings && japaneseEncodings->contains(canonicalEncodingName);
 }
 
+bool isReplacementEncoding(const char* alias)
+{
+    return alias && !strcasecmp(alias, "replacement");
+}
+
+bool isReplacementEncoding(const String& alias)
+{
+    return alias == "replacement";
+}
+
 bool shouldShowBackslashAsCurrencySymbolIn(const char* canonicalEncodingName)
 {
     return canonicalEncodingName && nonBackslashEncodings && nonBackslashEncodings->contains(canonicalEncodingName);
 }
 
 static void extendTextCodecMaps()
 {
     TextCodecReplacement::registerEncodingNames(addToTextEncodingNameMap);
     TextCodecReplacement::registerCodecs(addToTextCodecMap);
 
@@ skipping 73 matching lines @@
     MutexLocker lock(encodingRegistryMutex());
 
     TextEncodingNameMap::const_iterator it = textEncodingNameMap->begin();
     TextEncodingNameMap::const_iterator end = textEncodingNameMap->end();
     for (; it != end; ++it)
         fprintf(stderr, "'%s' => '%s'\n", it->key, it->value);
 }
 #endif
 
 } // namespace WTF