Make down-conversion explicit from CFX_ByteString to CFX_ByteStringC.

core/fpdfapi/fpdf_page/fpdf_page_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 "core/fpdfapi/fpdf_page/pageint.h"
 
 #include "core/fdrm/crypto/include/fx_crypt.h"
 #include "core/fpdfapi/fpdf_font/cpdf_type1font.h"
@@ skipping 313 matching lines @@
     const CPDF_Dictionary* pResources) {
   if (!pCSObj)
     return nullptr;
 
   if (pCSObj->IsName()) {
     CFX_ByteString name = pCSObj->GetConstString();
     CPDF_ColorSpace* pCS = CPDF_ColorSpace::ColorspaceFromName(name);
     if (!pCS && pResources) {
       CPDF_Dictionary* pList = pResources->GetDictBy("ColorSpace");
       if (pList) {
-        pCSObj = pList->GetDirectObjectBy(name);
+        pCSObj = pList->GetDirectObjectBy(name.AsByteStringC());
         return GetColorSpace(pCSObj, nullptr);
       }
     }
     if (!pCS || !pResources)
       return pCS;
 
     CPDF_Dictionary* pColorSpaces = pResources->GetDictBy("ColorSpace");
     if (!pColorSpaces)
       return pCS;
 
@@ skipping 265 matching lines @@
 }
 
 CPDF_CountedPattern* CPDF_DocPageData::FindPatternPtr(
     CPDF_Object* pPatternObj) const {
   if (!pPatternObj)
     return nullptr;
 
   auto it = m_PatternMap.find(pPatternObj);
   return it != m_PatternMap.end() ? it->second : nullptr;
 }