Make down-conversion explicit from CFX_ByteString to CFX_ByteStringC.

fpdfsdk/fsdk_mgr.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 "fpdfsdk/include/fsdk_mgr.h"
 
 #include <algorithm>
 #include <memory>
@@ skipping 168 matching lines @@
     return FALSE;
 
   CFX_FontMapper* pFontMapper = pFontMgr->GetBuiltinMapper();
   if (!pFontMapper)
     return FALSE;
 
   if (pFontMapper->m_InstalledTTFonts.empty())
     pFontMapper->LoadInstalledFonts();
 
   for (const auto& font : pFontMapper->m_InstalledTTFonts) {
-    if (font.Compare(sFontFaceName))
+    if (font.Compare(sFontFaceName.AsByteStringC()))
       return TRUE;
   }
 
   return FALSE;
 }
 
 CPDF_Font* CFX_SystemHandler::AddNativeTrueTypeFontToPDF(
     CPDF_Document* pDoc,
     CFX_ByteString sFontFaceName,
     uint8_t nCharset) {
@@ skipping 999 matching lines @@
   CPDFSDK_Annot* pFocusAnnot = m_pSDKDoc->GetFocusAnnot();
   if (!pFocusAnnot)
     return nullptr;
 
   for (CPDFSDK_Annot* pAnnot : m_fxAnnotArray) {
     if (pAnnot == pFocusAnnot)
       return pAnnot;
   }
   return nullptr;
 }