Don't pass null isolates to FXJS_ when we have a real isolate.

fpdfsdk/src/javascript/Document.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 "../../include/javascript/JavaScript.h"
 #include "../../include/javascript/IJavaScript.h"
 #include "../../include/javascript/JS_Define.h"
 #include "../../include/javascript/JS_Object.h"
@@ skipping 1410 matching lines @@
 
   for (int i = 0; i < iIconTreeLength; i++) {
     pIconElement = (*m_pIconTree)[i];
 
     v8::Local<v8::Object> pObj = FXJS_NewFxDynamicObj(
         pRuntime->GetIsolate(), pContext,
         FXJS_GetObjDefnID(pRuntime->GetIsolate(), L"Icon"));
     if (pObj.IsEmpty())
       return FALSE;
 
-    CJS_Icon* pJS_Icon = (CJS_Icon*)FXJS_GetPrivate(pObj);
+    CJS_Icon* pJS_Icon = (CJS_Icon*)FXJS_GetPrivate(m_isolate, pObj);
     if (!pJS_Icon)
       return FALSE;
 
     Icon* pIcon = (Icon*)pJS_Icon->GetEmbedObject();
     if (!pIcon)
       return FALSE;
 
     pIcon->SetStream(pIconElement->IconStream->GetStream());
     pIcon->SetIconName(pIconElement->IconName);
     Icons.SetElement(i, CJS_Value(m_isolate, pJS_Icon));
@@ skipping 23 matching lines @@
   for (int i = 0; i < iIconCounts; i++) {
     if ((*m_pIconTree)[i]->IconName == swIconName) {
       Icon* pRetIcon = (*m_pIconTree)[i]->IconStream;
 
       v8::Local<v8::Object> pObj = FXJS_NewFxDynamicObj(
           pRuntime->GetIsolate(), pContext,
           FXJS_GetObjDefnID(pRuntime->GetIsolate(), L"Icon"));
       if (pObj.IsEmpty())
         return FALSE;
 
-      CJS_Icon* pJS_Icon = (CJS_Icon*)FXJS_GetPrivate(pObj);
+      CJS_Icon* pJS_Icon = (CJS_Icon*)FXJS_GetPrivate(m_isolate, pObj);
       if (!pJS_Icon)
         return FALSE;
 
       Icon* pIcon = (Icon*)pJS_Icon->GetEmbedObject();
       if (!pIcon)
         return FALSE;
 
       pIcon->SetIconName(swIconName);
       pIcon->SetStream(pRetIcon->GetStream());
       vRet = pJS_Icon;
@@ skipping 364 matching lines @@
   CFX_DWordArray DelArray;
 
   for (int j = DelArray.GetSize() - 1; j >= 0; j--) {
     m_DelayData.RemoveAt(DelArray[j]);
   }
 }
 
 CJS_Document* Document::GetCJSDoc() const {
   return static_cast<CJS_Document*>(m_pJSObject);
 }