Make down-conversion explicit from CFX_ByteString to CFX_ByteStringC.

xfa/fxfa/app/xfa_fontmgr.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_fontmgr.h"
 
 #include <algorithm>
 
@@ skipping 1843 matching lines @@
   }
   pFontSetDict = (CPDF_Dictionary*)pFontSetDict->GetDictBy("Font");
   if (!pFontSetDict) {
     return NULL;
   }
   strPsName.Remove(' ');
   IFX_FontMgr* pFDEFontMgr = m_pDoc->GetApp()->GetFDEFontMgr();
   for (const auto& it : *pFontSetDict) {
     const CFX_ByteString& key = it.first;
     CPDF_Object* pObj = it.second;
-    if (!PsNameMatchDRFontName(strPsName, bBold, bItalic, key, bStrictMatch)) {
+    if (!PsNameMatchDRFontName(strPsName.AsByteStringC(), bBold, bItalic, key,
+                               bStrictMatch)) {
       continue;
     }
     CPDF_Object* pDirect = pObj->GetDirect();
     if (!pDirect || !pDirect->IsDictionary()) {
       return NULL;
     }
     CPDF_Dictionary* pFontDict = (CPDF_Dictionary*)pDirect;
     if (pFontDict->GetStringBy("Type") != "Font") {
       return NULL;
     }
@@ skipping 198 matching lines @@
     CXFA_PDFFontMgr* pMgr = NULL;
     m_PDFFontMgrArray.GetNextAssoc(ps, (void*&)hDoc, (void*&)pMgr);
     delete pMgr;
   }
   m_PDFFontMgrArray.RemoveAll();
   m_FontMap.clear();
 }
 void CXFA_FontMgr::SetDefFontMgr(CXFA_DefFontMgr* pFontMgr) {
   m_pDefFontMgr = pFontMgr;
 }