Pdfium does not create isolate when it runs in chromium

fpdfsdk/src/javascript/JS_Runtime.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 "JS_Runtime.h"
 
 #include "Consts.h"
 #include "Document.h"
@@ skipping 103 matching lines @@
 }
 
 CJS_Runtime::~CJS_Runtime() {
   for (auto* obs : m_observers)
     obs->OnDestroyed();
 
   for (int i = 0, sz = m_ContextArray.GetSize(); i < sz; i++)
     delete m_ContextArray.GetAt(i);
 
   m_ContextArray.RemoveAll();
-#ifndef PDF_ENABLE_XFA
   FXJS_ReleaseRuntime(GetIsolate(), &m_context, &m_StaticObjects);
-#endif
 
   m_pApp = NULL;
   m_pDocument = NULL;
   m_context.Reset();
 
   if (m_isolateManaged)
     m_isolate->Dispose();
 }
 
 void CJS_Runtime::DefineJSObjects() {
@@ skipping 191 matching lines @@
 #endif
 void CJS_Runtime::AddObserver(Observer* observer) {
   ASSERT(!pdfium::ContainsKey(m_observers, observer));
   m_observers.insert(observer);
 }
 
 void CJS_Runtime::RemoveObserver(Observer* observer) {
   ASSERT(pdfium::ContainsKey(m_observers, observer));
   m_observers.erase(observer);
 }