Document attribute charset and its aliases to return UTF-8

Source/core/dom/DocumentEncodingData.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 18 matching lines @@
  */
 
 #include "config.h"
 #include "core/dom/DocumentEncodingData.h"
 
 #include "core/html/parser/TextResourceDecoder.h"
 
 namespace blink {
 
 DocumentEncodingData::DocumentEncodingData()
-    : m_wasDetectedHeuristically(false)
+    : m_encoding(UTF8Encoding())
+    , m_wasDetectedHeuristically(false)
     , m_sawDecodingError(false)
 {
 }
 
 DocumentEncodingData::DocumentEncodingData(const TextResourceDecoder& decoder)
 {
     m_encoding = decoder.encoding();
     m_wasDetectedHeuristically = decoder.encodingWasDetectedHeuristically();
     m_sawDecodingError = decoder.sawError();
 }
 
 void DocumentEncodingData::setEncoding(const WTF::TextEncoding& encoding)
 {
     m_encoding = encoding;
 }
 
 } // namespace blink