Protect against unexpected library create/destroy

core/fpdfapi/cpdf_modulemgr.h

 // 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
 
 #ifndef CORE_FPDFAPI_CPDF_MODULEMGR_H_
 #define CORE_FPDFAPI_CPDF_MODULEMGR_H_
 
 #include <memory>
@@ skipping 17 matching lines @@
 
   void* GetUnspInfo() const { return m_unsp_info; }
 
  private:
   void* const m_unsp_info;
 };
 
 class CPDF_ModuleMgr {
  public:
   static CPDF_ModuleMgr* Get();
-  static void Create();
   static void Destroy();
   static const int kFileBufSize = 512;
 
   void SetCodecModule(CCodec_ModuleMgr* pModule) { m_pCodecModule = pModule; }
   CCodec_ModuleMgr* GetCodecModule() { return m_pCodecModule; }
 
   void InitPageModule();
   CPDF_PageModule* GetPageModule() const { return m_pPageModule.get(); }
 
   void SetUnsupportInfoAdapter(
@@ skipping 19 matching lines @@
  private:
   CPDF_ModuleMgr();
   ~CPDF_ModuleMgr();
 
   CCodec_ModuleMgr* m_pCodecModule;
   std::unique_ptr<CPDF_PageModule> m_pPageModule;
   std::unique_ptr<CFSDK_UnsupportInfo_Adapter> m_pUnsupportInfoAdapter;
 };
 
 #endif  // CORE_FPDFAPI_CPDF_MODULEMGR_H_