Remove FWL theme subclasses

xfa/fxfa/app/xfa_fwltheme.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_FXFA_APP_XFA_FWLTHEME_H_
 #define XFA_FXFA_APP_XFA_FWLTHEME_H_
 
 #include <memory>
@@ skipping 45 matching lines @@
   std::unique_ptr<CFDE_TextOut> m_pTextOut;
   FX_FLOAT m_fCapacity;
   uint32_t m_dwCapacity;
   CFGAS_GEFont* m_pCalendarFont;
   CFX_WideString m_wsResource;
   CXFA_FFApp* const m_pApp;
   CFX_RectF m_Rect;
   CFX_SizeF m_SizeAboveBelow;
 };
 
-class CXFA_FWLCheckBoxTP : public CFWL_CheckBoxTP {
- public:
-  CXFA_FWLCheckBoxTP();
-
-  // CFWL_CheckBoxTP
-  FX_BOOL DrawBackground(CFWL_ThemeBackground* pParams) override;
-
- protected:
-  void DrawCheckSign(IFWL_Widget* pWidget,
-                     CFX_Graphics* pGraphics,
-                     const CFX_RectF* pRtBox,
-                     int32_t iState,
-                     CFX_Matrix* pMatrix);
-};
-
-class CXFA_FWLEditTP : public CFWL_EditTP {
- public:
-  CXFA_FWLEditTP();
-  ~CXFA_FWLEditTP() override;
-
-  // CFWL_EditTP
-  FX_BOOL DrawBackground(CFWL_ThemeBackground* pParams) override;
-};
+CXFA_FFWidget* XFA_ThemeGetOuterWidget(IFWL_Widget* pWidget);
 
 #endif  // XFA_FXFA_APP_XFA_FWLTHEME_H_