Make down-conversion explicit from CFX_ByteString to CFX_ByteStringC.

core/fpdfapi/fpdf_edit/fpdf_edit_doc.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 <limits.h>
 
 #include "core/fpdfapi/fpdf_font/include/cpdf_font.h"
 #include "core/fpdfapi/fpdf_font/include/cpdf_fontencoding.h"
@@ skipping 1106 matching lines @@
     return NULL;
   }
   return pDict;
 }
 
 CPDF_Font* CPDF_Document::AddStandardFont(const FX_CHAR* font,
                                           CPDF_FontEncoding* pEncoding) {
   CFX_ByteString name(font);
   if (PDF_GetStandardFontName(&name) < 0)
     return nullptr;
-  return GetPageData()->GetStandardFont(name, pEncoding);
+  return GetPageData()->GetStandardFont(name.AsByteStringC(), pEncoding);
 }
 
 void CPDF_Document::DeletePage(int iPage) {
   CPDF_Dictionary* pRoot = GetRoot();
   if (!pRoot) {
     return;
   }
   CPDF_Dictionary* pPages = pRoot->GetDictBy("Pages");
   if (!pPages) {
     return;
@@ skipping 13 matching lines @@
 void FPDFAPI_FlatPageAttr(CPDF_Dictionary* pPageDict,
                           const CFX_ByteStringC& name) {
   if (pPageDict->KeyExist(name)) {
     return;
   }
   CPDF_Object* pObj = FPDFAPI_GetPageAttr(pPageDict, name);
   if (pObj) {
     pPageDict->SetAt(name, pObj->Clone());
   }
 }