Remove implicit cast from CFX_ByteString to (const char*).

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 822 matching lines @@
   pSDKAnnot = pAnnotHandler->NewAnnot(pPDFAnnot, this);
   if (!pSDKAnnot)
     return nullptr;
 
   m_fxAnnotArray.push_back(pSDKAnnot);
   return pSDKAnnot;
 }
 #endif  // PDF_ENABLE_XFA
 
 CPDFSDK_Annot* CPDFSDK_PageView::AddAnnot(CPDF_Dictionary* pDict) {
-  return pDict ? AddAnnot(pDict->GetStringBy("Subtype"), pDict) : nullptr;
+  return pDict ? AddAnnot(pDict->GetStringBy("Subtype").c_str(), pDict)
+               : nullptr;
 }
 
 CPDFSDK_Annot* CPDFSDK_PageView::AddAnnot(const FX_CHAR* lpSubType,
                                           CPDF_Dictionary* pDict) {
   return NULL;
 }
 
 FX_BOOL CPDFSDK_PageView::DeleteAnnot(CPDFSDK_Annot* pAnnot) {
 #ifdef PDF_ENABLE_XFA
   if (!pAnnot)
@@ skipping 345 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;
 }