Prevent direct use of "replacement" text encoding.

Source/wtf/text/TextCodecReplacement.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "wtf/text/TextCodecReplacement.h"
 
 #include "wtf/PassOwnPtr.h"
 #include "wtf/text/WTFString.h"
 #include "wtf/unicode/CharacterNames.h"
 
 namespace WTF {
 
 TextCodecReplacement::TextCodecReplacement()
     : m_sentEOF(false)
 {
 }
 
 void TextCodecReplacement::registerEncodingNames(EncodingNameRegistrar registrar)
 {
-    // FIXME: The 'replacement' label itself should not be referenceable by
+    // The 'replacement' label itself should not be referenceable by
     // resources or script - it's a specification convenience - but much of
     // the wtf/text API asserts that an encoding name is a label for itself.
-    // crbug.com/277037
+    // This is handled in TextEncoding by marking it as not valid.
     registrar("replacement", "replacement");
 
     registrar("csiso2022kr", "replacement");
     registrar("hz-gb-2312", "replacement");
     registrar("iso-2022-cn", "replacement");
     registrar("iso-2022-cn-ext", "replacement");
     registrar("iso-2022-kr", "replacement");
 }
 
 static PassOwnPtr<TextCodec> newStreamingTextDecoderReplacement(const TextEncoding&, const void*)
@@ skipping 10 matching lines @@
 {
     sawError = true;
     if (m_sentEOF)
         return String();
 
     m_sentEOF = true;
     return String(&Unicode::replacementCharacter, 1);
 }
 
 } // namespace WTF