Remove some FWL code.

xfa/fwl/core/fwl_threadimp.h

 // 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
 
 #ifndef XFA_FWL_CORE_FWL_THREADIMP_H_
 #define XFA_FWL_CORE_FWL_THREADIMP_H_
 
 #include "xfa/fwl/core/ifwl_thread.h"
 
 class CFWL_NoteDriver;
 class IFWL_NoteDriver;
 class IFWL_NoteThread;
 
 class CFWL_ThreadImp {
  public:
   virtual ~CFWL_ThreadImp() {}
   IFWL_Thread* GetInterface() const { return m_pIface; }
-  virtual FWL_ERR Run(FWL_HTHREAD hThread);
 
  protected:
   CFWL_ThreadImp(IFWL_Thread* pIface) : m_pIface(pIface) {}
 
  private:
   IFWL_Thread* const m_pIface;
 };
 
 class CFWL_NoteThreadImp : public CFWL_ThreadImp {
  public:
   CFWL_NoteThreadImp(IFWL_NoteThread* pIface);
   virtual ~CFWL_NoteThreadImp();
 
-  FWL_ERR Run(FWL_HTHREAD hThread) override;
   virtual IFWL_NoteDriver* GetNoteDriver();
 
  protected:
   CFWL_NoteDriver* const m_pNoteDriver;
 };
 
 #endif  // XFA_FWL_CORE_FWL_THREADIMP_H_