Add 8bit Content-Transfer-Encoding support for reading MHTML files

Source/core/platform/network/MIMEHeader.h

 /*
  * Copyright (C) 2011 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 28 matching lines @@
 namespace WebCore {
 
 class SharedBufferChunkReader;
 
 // FIXME: This class is a limited MIME parser used to parse the MIME headers of MHTML files.
 class MIMEHeader : public RefCounted<MIMEHeader> {
 public:
     enum Encoding {
         QuotedPrintable,
         Base64,
+        EightBit,
         SevenBit,
         Binary,
         Unknown
     };
 
     static PassRefPtr<MIMEHeader> parseHeader(SharedBufferChunkReader* crLFLineReader);
 
     bool isMultipart() const { return m_contentType.startsWith("multipart/"); }
 
     String contentType() const { return m_contentType; }
@@ skipping 16 matching lines @@
     Encoding m_contentTransferEncoding;
     String m_contentLocation;
     String m_multipartType;
     String m_endOfPartBoundary;
     String m_endOfDocumentBoundary;
 };
 
 }
 
 #endif