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

fpdfsdk/javascript/global.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/javascript/global.h"
 
 #include <vector>
 
@@ skipping 396 matching lines @@
   m_mapGlobal.clear();
 }
 
 FX_BOOL JSGlobalAlternate::SetGlobalVariables(const CFX_ByteString& propname,
                                               int nType,
                                               double dData,
                                               bool bData,
                                               const CFX_ByteString& sData,
                                               v8::Local<v8::Object> pData,
                                               bool bDefaultPersistent) {
-  if (!propname)
+  if (propname.IsEmpty())
     return FALSE;
 
   auto it = m_mapGlobal.find(propname);
   if (it != m_mapGlobal.end()) {
     JSGlobalData* pTemp = it->second;
     if (pTemp->bDeleted || pTemp->nType != nType) {
       pTemp->dData = 0;
       pTemp->bData = 0;
       pTemp->sData = "";
       pTemp->nType = nType;
@@ skipping 76 matching lines @@
     return CJS_Value::VT_boolean;
   if (nHash == JSCONST_nDateHash)
     return CJS_Value::VT_date;
   if (nHash == JSCONST_nObjectHash)
     return CJS_Value::VT_object;
   if (nHash == JSCONST_nFXobjHash)
     return CJS_Value::VT_fxobject;
 
   return CJS_Value::VT_unknown;
 }