Make a bunch of JBig2 classes independent of CJBig2_Object.

core/src/fxcodec/jbig2/JBig2_ArithIntDecoder.h

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #ifndef _JBIG2_ARITH_INT_DECODER_H_
 #define _JBIG2_ARITH_INT_DECODER_H_
 #include "JBig2_Module.h"
 #include "JBig2_ArithDecoder.h"
-class CJBig2_ArithIntDecoder : public CJBig2_Object {
+class CJBig2_ArithIntDecoder {
  public:
   CJBig2_ArithIntDecoder();
 
   ~CJBig2_ArithIntDecoder();
 
   int decode(CJBig2_ArithDecoder* pArithDecoder, int* nResult);
 
  private:
   JBig2ArithCtx* IAx;
 };
-class CJBig2_ArithIaidDecoder : public CJBig2_Object {
+class CJBig2_ArithIaidDecoder {
  public:
   CJBig2_ArithIaidDecoder(unsigned char SBSYMCODELENA);
 
   ~CJBig2_ArithIaidDecoder();
 
   int decode(CJBig2_ArithDecoder* pArithDecoder, int* nResult);
 
  private:
   JBig2ArithCtx* IAID;
 
   unsigned char SBSYMCODELEN;
 };
 #endif