Don't use array for only one compatible mode script

xfa/fxfa/parser/xfa_script_imp.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 "xfa/fxfa/parser/xfa_script_imp.h"
 
 #include "core/fxcrt/include/fx_ext.h"
 #include "xfa/fxfa/app/xfa_ffnotify.h"
@@ skipping 406 matching lines @@
 FX_BOOL CXFA_ScriptContext::IsStrictScopeInJavaScript() {
   return m_pDocument->HasFlag(XFA_DOCFLAG_StrictScoping);
 }
 XFA_SCRIPTLANGTYPE CXFA_ScriptContext::GetType() {
   return m_eScriptType;
 }
 void CXFA_ScriptContext::DefineJsContext() {
   m_pJsContext = FXJSE_Context_Create(m_pIsolate, &GlobalClassDescriptor,
                                       m_pDocument->GetRoot());
   RemoveBuiltInObjs(m_pJsContext);
-  FXJSE_Context_EnableCompatibleMode(
-      m_pJsContext, FXJSE_COMPATIBLEMODEFLAG_CONSTRUCTOREXTRAMETHODS);
+  FXJSE_Context_EnableCompatibleMode(m_pJsContext);
 }
 CFXJSE_Context* CXFA_ScriptContext::CreateVariablesContext(
     CXFA_Node* pScriptNode,
     CXFA_Node* pSubform) {
   if (!pScriptNode || !pSubform)
     return nullptr;
 
   CFXJSE_Context* pVariablesContext =
       FXJSE_Context_Create(m_pIsolate, &VariablesClassDescriptor,
                            new CXFA_ThisProxy(pSubform, pScriptNode));
   RemoveBuiltInObjs(pVariablesContext);
-  FXJSE_Context_EnableCompatibleMode(
-      pVariablesContext, FXJSE_COMPATIBLEMODEFLAG_CONSTRUCTOREXTRAMETHODS);
+  FXJSE_Context_EnableCompatibleMode(pVariablesContext);
   m_mapVariableToContext.SetAt(pScriptNode, pVariablesContext);
   return pVariablesContext;
 }
 CXFA_Object* CXFA_ScriptContext::GetVariablesThis(CXFA_Object* pObject,
                                                   FX_BOOL bScriptNode) {
   if (pObject->GetObjectType() != XFA_OBJECTTYPE_VariablesThis)
     return pObject;
 
   CXFA_ThisProxy* pProxy = static_cast<CXFA_ThisProxy*>(pObject);
   return bScriptNode ? pProxy->GetScriptNode() : pProxy->GetThisNode();
@@ skipping 312 matching lines @@
   }
 }
 void CXFA_ScriptContext::AddNodesOfRunScript(CXFA_Node* pNode) {
   if (!m_pScriptNodeArray) {
     return;
   }
   if (m_pScriptNodeArray->Find(pNode) == -1) {
     m_pScriptNodeArray->Add(pNode);
   }
 }