Remove an unneccessary FIXME comment for HTMLToken

Source/core/html/parser/CompactHTMLToken.cpp

 /*
  * Copyright (C) 2013 Google, Inc. All Rights Reserved.
  *
  * 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 37 matching lines @@
 {
     switch (m_type) {
     case HTMLToken::Uninitialized:
         ASSERT_NOT_REACHED();
         break;
     case HTMLToken::DOCTYPE: {
         m_data = attemptStaticStringCreation(token->name(), Likely8Bit);
 
         // There is only 1 DOCTYPE token per document, so to avoid increasing the
         // size of CompactHTMLToken, we just use the m_attributes vector.
-        m_attributes.append(Attribute(attemptStaticStringCreation(token->publicIdentifier(), Likely8Bit), String(token->systemIdentifier())));
+        m_attributes.append(Attribute(token->publicIdentifier(), token->systemIdentifier()));
         m_doctypeForcesQuirks = token->forceQuirks();
         break;
     }
     case HTMLToken::EndOfFile:
         break;
     case HTMLToken::StartTag:
         m_attributes.reserveInitialCapacity(token->attributes().size());
         for (Vector<HTMLToken::Attribute>::const_iterator it = token->attributes().begin(); it != token->attributes().end(); ++it)
             m_attributes.append(Attribute(attemptStaticStringCreation(it->name, Likely8Bit), StringImpl::create8BitIfPossible(it->value)));
         // Fall through!
@@ skipping 26 matching lines @@
     for (Vector<Attribute>::const_iterator it = m_attributes.begin(); it != m_attributes.end(); ++it) {
         if (!it->name.isSafeToSendToAnotherThread())
             return false;
         if (!it->value.isSafeToSendToAnotherThread())
             return false;
     }
     return m_data.isSafeToSendToAnotherThread();
 }
 
 }