Don't initialize ICU replacement character for UTF-32 encodings

third_party/WebKit/Source/wtf/text/TextCodecICU.h

 /*
  * Copyright (C) 2004, 2006, 2007, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov <ap@nypop.com>
  *
  * 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 69 matching lines @@
                      bool flush,
                      UErrorCode&);
 
   TextEncoding m_encoding;
   mutable UConverter* m_converterICU;
 #if defined(USING_SYSTEM_ICU)
   mutable bool m_needsGBKFallbacks;
 #endif
 
   FRIEND_TEST_ALL_PREFIXES(TextCodecICUTest, IgnorableCodePoint);
+  FRIEND_TEST_ALL_PREFIXES(TextCodecICUTest, UTF32AndQuestionMarks);
+  FRIEND_TEST_ALL_PREFIXES(TextCodecICUTest, UTF32Aliases);
 };
 
 struct ICUConverterWrapper {
   WTF_MAKE_NONCOPYABLE(ICUConverterWrapper);
   USING_FAST_MALLOC(ICUConverterWrapper);
 
  public:
   ICUConverterWrapper() : converter(0) {}
   ~ICUConverterWrapper();
 
   UConverter* converter;
 };
 
 }  // namespace WTF
 
 #endif  // TextCodecICU_h