Remove dedicated TextCodecUTF16

Source/wtf/text/TextEncoding.h

 /*
  * Copyright (C) 2004, 2006, 2007, 2008, 2009 Apple 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 24 matching lines @@
 
 class WTF_EXPORT TextEncoding {
 public:
     TextEncoding() : m_name(0) { }
     TextEncoding(const char* name);
     TextEncoding(const String& name);
 
     bool isValid() const { return m_name; }
     const char* name() const { return m_name; }
     bool usesVisualOrdering() const;
+    bool isNonByteBasedEncoding() const;
     const TextEncoding& closestByteBasedEquivalent() const;
     const TextEncoding& encodingForFormSubmission() const;
 
     String decode(const char* str, size_t length) const
     {
         bool ignored;
         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;
 
 private:
-    bool isNonByteBasedEncoding() const;
     bool isUTF7Encoding() const;
 
     const char* m_name;
 };
 
 inline bool operator==(const TextEncoding& a, const TextEncoding& b) { return a.name() == b.name(); }
 inline bool operator!=(const TextEncoding& a, const TextEncoding& b) { return a.name() != b.name(); }
 
 WTF_EXPORT const TextEncoding& ASCIIEncoding();
 WTF_EXPORT const TextEncoding& Latin1Encoding();
 WTF_EXPORT const TextEncoding& UTF16BigEndianEncoding();
 WTF_EXPORT const TextEncoding& UTF16LittleEndianEncoding();
 WTF_EXPORT const TextEncoding& UTF32BigEndianEncoding();
 WTF_EXPORT const TextEncoding& UTF32LittleEndianEncoding();
 WTF_EXPORT const TextEncoding& UTF8Encoding();
 WTF_EXPORT const TextEncoding& WindowsLatin1Encoding();
 
 } // namespace WTF
 
 using WTF::ASCIIEncoding;
 using WTF::Latin1Encoding;
 using WTF::UTF16BigEndianEncoding;
 using WTF::UTF16LittleEndianEncoding;
 using WTF::UTF32BigEndianEncoding;
 using WTF::UTF32LittleEndianEncoding;
 using WTF::UTF8Encoding;
 using WTF::WindowsLatin1Encoding;
 
 #endif // TextEncoding_h