Fix stack overflow in object Clone() functions

core/fpdfapi/fpdf_parser/cpdf_boolean.cpp

 // Copyright 2016 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 "core/fpdfapi/fpdf_parser/cpdf_boolean.h"
 
 CPDF_Boolean::CPDF_Boolean() : m_bValue(false) {}
 
 CPDF_Boolean::CPDF_Boolean(bool value) : m_bValue(value) {}
 
 CPDF_Boolean::~CPDF_Boolean() {}
 
 CPDF_Object::Type CPDF_Boolean::GetType() const {
   return BOOLEAN;
 }
 
-CPDF_Object* CPDF_Boolean::Clone(FX_BOOL bDirect) const {
+CPDF_Object* CPDF_Boolean::Clone() const {
   return new CPDF_Boolean(m_bValue);
 }
 
 CFX_ByteString CPDF_Boolean::GetString() const {
   return m_bValue ? "true" : "false";
 }
 
 int CPDF_Boolean::GetInteger() const {
   return m_bValue;
 }
 
 void CPDF_Boolean::SetString(const CFX_ByteString& str) {
   m_bValue = (str == "true");
 }
 
 bool CPDF_Boolean::IsBoolean() const {
   return true;
 }
 
 CPDF_Boolean* CPDF_Boolean::AsBoolean() {
   return this;
 }
 
 const CPDF_Boolean* CPDF_Boolean::AsBoolean() const {
   return this;
 }