Encoding API: Update tests and simplify constructors

Source/modules/encoding/TextDecoder.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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 33 matching lines @@
 
     WTF::TextEncoding encoding(encodingLabel);
     if (!encoding.isValid()) {
         exceptionState.throwTypeError("The encoding label provided ('" + encodingLabel + "') is invalid.");
         return 0;
     }
 
     bool fatal = false;
     options.get("fatal", fatal);
 
-    return new TextDecoder(encoding.name(), fatal);
+    return new TextDecoder(encoding, fatal);
 }
 
 
-TextDecoder::TextDecoder(const String& encoding, bool fatal)
+TextDecoder::TextDecoder(const WTF::TextEncoding& encoding, bool fatal)
     : m_encoding(encoding)
-    , m_codec(newTextCodec(m_encoding))
+    , m_codec(newTextCodec(encoding))
     , m_fatal(fatal)
     , m_bomSeen(false)
 {
 }
 
 TextDecoder::~TextDecoder()
 {
 }
 
 String TextDecoder::encoding() const
@@ skipping 31 matching lines @@
             s.remove(0);
     }
 
     if (flush)
         m_bomSeen = false;
 
     return s;
 }
 
 } // namespace WebCore