Cleanup some extern method declarations.

xfa/fwl/core/fwl_noteimp.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_NOTEIMP_H_
 #define XFA_FWL_CORE_FWL_NOTEIMP_H_
 
 #include "xfa/fwl/core/ifwl_notedriver.h"
@@ skipping 37 matching lines @@
   FX_BOOL m_bContinueModal;
 };
 
 class CFWL_NoteDriver : public IFWL_NoteDriver {
  public:
   CFWL_NoteDriver();
   ~CFWL_NoteDriver() override;
 
   // IFWL_NoteDriver:
   FX_BOOL SendNote(CFWL_Note* pNote) override;
-  FX_BOOL PostMessage(CFWL_Message* pMessage) override;
   FWL_ERR RegisterEventTarget(IFWL_Widget* pListener,
                               IFWL_Widget* pEventSource = NULL,
                               FX_DWORD dwFilter = FWL_EVENT_ALL_MASK) override;
   FWL_ERR UnregisterEventTarget(IFWL_Widget* pListener) override;
   void ClearEventTargets(FX_BOOL bRemoveAll) override;
   int32_t GetQueueMaxSize() const override;
   FWL_ERR SetQueueMaxSize(const int32_t size) override;
   IFWL_NoteThread* GetOwnerThread() const override;
   FWL_ERR PushNoteLoop(IFWL_NoteLoop* pNoteLoop) override;
   IFWL_NoteLoop* PopNoteLoop() override;
@@ skipping 93 matching lines @@
   IFWL_ToolTipTarget* pCurTarget;
   CFWL_ToolTipImp* m_pToolTipImp;
   CFWL_CoreToolTipDP* m_ToolTipDp;
   CFX_PtrArray m_arrWidget;
 
  private:
   static CFWL_ToolTipContainer* s_pInstance;
 };
 
 #endif  // XFA_FWL_CORE_FWL_NOTEIMP_H_