Cleanup remaining IFWL files for visiblity and usage.

xfa/fwl/core/ifwl_caret.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_IFWL_CARET_H_
 #define XFA_FWL_CORE_IFWL_CARET_H_
 
 #include <memory>
@@ skipping 16 matching lines @@
 
   // IFWL_Widget
   FWL_Type GetClassID() const override;
   void DrawWidget(CFX_Graphics* pGraphics,
                   const CFX_Matrix* pMatrix = nullptr) override;
   void OnProcessMessage(CFWL_Message* pMessage) override;
   void OnDrawWidget(CFX_Graphics* pGraphics,
                     const CFX_Matrix* pMatrix) override;
 
   void ShowCaret(bool bFlag = true);
-  FWL_Error GetFrequency(uint32_t& elapse);
-  FWL_Error SetFrequency(uint32_t elapse);
-  FWL_Error SetColor(CFX_Color crFill);
 
- protected:
+ private:
   class Timer : public IFWL_Timer {
    public:
     explicit Timer(IFWL_Caret* pCaret);
     ~Timer() override {}
 
     void Run(IFWL_TimerInfo* hTimer) override;
   };
   friend class IFWL_Caret::Timer;
 
   void DrawCaretBK(CFX_Graphics* pGraphics,
                    IFWL_ThemeProvider* pTheme,
                    const CFX_Matrix* pMatrix);
 
   std::unique_ptr<IFWL_Caret::Timer> m_pTimer;
   IFWL_TimerInfo* m_pTimerInfo;  // not owned.
-  uint32_t m_dwElapse;
-  CFX_Color m_crFill;
-  bool m_bSetColor;
 };
 
 #endif  // XFA_FWL_CORE_IFWL_CARET_H_