Cleanup remaining IFWL files for visiblity and usage.

xfa/fwl/core/ifwl_checkbox.h

Index: xfa/fwl/core/ifwl_checkbox.h
diff --git a/xfa/fwl/core/ifwl_checkbox.h b/xfa/fwl/core/ifwl_checkbox.h
index d3dfd2680d5b655dafcc24dddf63d4208925383d..cda02b51687be28f33923d98f3fc4630512d9879 100644
--- a/xfa/fwl/core/ifwl_checkbox.h
+++ b/xfa/fwl/core/ifwl_checkbox.h
@@ -56,8 +56,8 @@ class IFWL_CheckBoxDP : public IFWL_DataProvider {
 
 class IFWL_CheckBox : public IFWL_Widget {
  public:
-  explicit IFWL_CheckBox(const IFWL_App* app,
-                         std::unique_ptr<CFWL_WidgetProperties> properties);
+  IFWL_CheckBox(const IFWL_App* app,
+                std::unique_ptr<CFWL_WidgetProperties> properties);
   ~IFWL_CheckBox() override;
 
   // IFWL_Widget
@@ -71,14 +71,19 @@ class IFWL_CheckBox : public IFWL_Widget {
   void OnDrawWidget(CFX_Graphics* pGraphics,
                     const CFX_Matrix* pMatrix) override;
 
-  int32_t GetCheckState();
-  FWL_Error SetCheckState(int32_t iCheck);
-
- protected:
+ private:
+  void SetCheckState(int32_t iCheck);
   void Layout();
   uint32_t GetPartStates();
   void UpdateTextOutStyles();
   void NextStates();
+  void OnActivate(CFWL_Message* pMsg);
+  void OnFocusChanged(CFWL_Message* pMsg, bool bSet);
+  void OnLButtonDown(CFWL_MsgMouse* pMsg);
+  void OnLButtonUp(CFWL_MsgMouse* pMsg);
+  void OnMouseMove(CFWL_MsgMouse* pMsg);
+  void OnMouseLeave(CFWL_MsgMouse* pMsg);
+  void OnKeyDown(CFWL_MsgKey* pMsg);
 
   CFX_RectF m_rtClient;
   CFX_RectF m_rtBox;
@@ -87,15 +92,6 @@ class IFWL_CheckBox : public IFWL_Widget {
   uint32_t m_dwTTOStyles;
   int32_t m_iTTOAlign;
   bool m_bBtnDown;
-
- private:
-  void OnActivate(CFWL_Message* pMsg);
-  void OnFocusChanged(CFWL_Message* pMsg, bool bSet);
-  void OnLButtonDown(CFWL_MsgMouse* pMsg);
-  void OnLButtonUp(CFWL_MsgMouse* pMsg);
-  void OnMouseMove(CFWL_MsgMouse* pMsg);
-  void OnMouseLeave(CFWL_MsgMouse* pMsg);
-  void OnKeyDown(CFWL_MsgKey* pMsg);
 };
 
 #endif  // XFA_FWL_CORE_IFWL_CHECKBOX_H_