Add missing const to CPDF_Stream::InitStream()

core/fpdfapi/fpdf_parser/cpdf_stream.cpp

 // Copyright 2016 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
 
 #include "core/fpdfapi/fpdf_parser/include/cpdf_stream.h"
 
 #include "core/fpdfapi/fpdf_parser/include/cpdf_dictionary.h"
 #include "core/fpdfapi/fpdf_parser/include/cpdf_stream_acc.h"
@@ skipping 39 matching lines @@
       m_pDict->Release();
     m_pDict = pDict;
   }
   if (IsMemoryBased())
     FX_Free(m_pDataBuf);
 
   m_GenNum = 0;
   m_pFile = nullptr;
 }
 
-void CPDF_Stream::InitStream(uint8_t* pData,
+void CPDF_Stream::InitStream(const uint8_t* pData,
                              uint32_t size,
                              CPDF_Dictionary* pDict) {
   InitStreamInternal(pDict);
   m_GenNum = kMemoryBasedGenNum;
   m_pDataBuf = FX_Alloc(uint8_t, size);
   if (pData)
     FXSYS_memcpy(m_pDataBuf, pData, size);
 
   m_dwSize = size;
   if (m_pDict)
@@ skipping 57 matching lines @@
   if (m_pDict)
     m_pDict->SetAtInteger("Length", m_dwSize);
 }
 
 CFX_WideString CPDF_Stream::GetUnicodeText() const {
   CPDF_StreamAcc stream;
   stream.LoadAllData(this, FALSE);
   return PDF_DecodeText(stream.GetData(), stream.GetSize());
 }