Make down-conversion explicit from CFX_ByteString to CFX_ByteStringC.

xfa/fxfa/app/xfa_checksum.cpp

 // 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
 
 #include "xfa/include/fxfa/xfa_checksum.h"
 
 #include "core/fdrm/crypto/include/fx_crypt.h"
 #include "xfa/fgas/crt/fgas_algorithm.h"
@@ skipping 55 matching lines @@
 }
 void CXFA_SAXReaderHandler::OnTagClose(void* pTag, uint32_t dwEndPos) {
   if (pTag == NULL) {
     return;
   }
   CXFA_SAXContext* pSAXContext = (CXFA_SAXContext*)pTag;
   CFX_ByteTextBuf& textBuf = pSAXContext->m_TextBuf;
   if (pSAXContext->m_eNode == FX_SAXNODE_Instruction) {
     textBuf << "?>";
   } else if (pSAXContext->m_eNode == FX_SAXNODE_Tag) {
-    textBuf << "></" << pSAXContext->m_bsTagName << ">";
+    textBuf << "></" << pSAXContext->m_bsTagName.AsByteStringC() << ">";
   }
   UpdateChecksum(FALSE);
 }
 void CXFA_SAXReaderHandler::OnTagEnd(void* pTag,
                                      const CFX_ByteStringC& bsTagName,
                                      uint32_t dwEndPos) {
   if (pTag == NULL) {
     return;
   }
   CFX_ByteTextBuf& textBuf = ((CXFA_SAXContext*)pTag)->m_TextBuf;
@@ skipping 92 matching lines @@
   }
 }
 void CXFA_ChecksumContext::GetChecksum(CFX_ByteString& bsChecksum) {
   bsChecksum = m_bsChecksum;
 }
 void CXFA_ChecksumContext::Update(const CFX_ByteStringC& bsText) {
   if (m_pByteContext) {
     CRYPT_SHA1Update(m_pByteContext, bsText.GetPtr(), bsText.GetLength());
   }
 }