Cleanup unneeded FWL theme code.

xfa/fwl/theme/cfwl_checkboxtp.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_THEME_CFWL_CHECKBOXTP_H_
 #define XFA_FWL_THEME_CFWL_CHECKBOXTP_H_
 
 #include <memory>
 
 #include "xfa/fwl/theme/cfwl_utils.h"
 #include "xfa/fwl/theme/cfwl_widgettp.h"
 
 class CFWL_CheckBoxTP : public CFWL_WidgetTP {
  public:
   CFWL_CheckBoxTP();
   ~CFWL_CheckBoxTP() override;
 
   // CFWL_WidgeTP
   bool IsValidWidget(IFWL_Widget* pWidget) override;
-  uint32_t SetThemeID(IFWL_Widget* pWidget,
-                      uint32_t dwThemeID,
-                      FX_BOOL bChildren = TRUE) override;
+  uint32_t SetThemeID(IFWL_Widget* pWidget, uint32_t dwThemeID) override;
   FX_BOOL DrawText(CFWL_ThemeText* pParams) override;
   FX_BOOL DrawBackground(CFWL_ThemeBackground* pParams) override;
   FWL_Error Initialize() override;
   FWL_Error Finalize() override;
 
  protected:
   struct CKBThemeData {
     FX_ARGB clrBoxBk[13][2];
     FX_ARGB clrSignBorderNormal;
     FX_ARGB clrSignBorderDisable;
@@ skipping 47 matching lines @@
                       FX_BOOL bDisable,
                       CFX_Matrix* pMatrix);
   void SetThemeData(uint32_t dwID);
   void InitCheckPath(FX_FLOAT fCheckLen);
 
   std::unique_ptr<CKBThemeData> m_pThemeData;
   std::unique_ptr<CFX_Path> m_pCheckPath;
 };
 
 #endif  // XFA_FWL_THEME_CFWL_CHECKBOXTP_H_