Cleanup cfwl_* files.

xfa/fwl/core/ifwl_pushbutton.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_PUSHBUTTON_H_
 #define XFA_FWL_CORE_IFWL_PUSHBUTTON_H_
 
 #include "xfa/fwl/core/cfwl_widgetproperties.h"
@@ skipping 13 matching lines @@
 #define FWL_STYLEEXT_PSB_VLayoutMask (3L << 2)
 #define FWL_STYLEEXT_PSB_ModeMask (3L << 4)
 #define FWL_STATE_PSB_Hovered (1 << FWL_WGTSTATE_MAX)
 #define FWL_STATE_PSB_Pressed (1 << (FWL_WGTSTATE_MAX + 1))
 #define FWL_STATE_PSB_Default (1 << (FWL_WGTSTATE_MAX + 2))
 
 class CFWL_MsgMouse;
 class CFX_DIBitmap;
 class IFWL_Widget;
 
-class IFWL_PushButtonDP : public IFWL_DataProvider {
- public:
-  virtual CFX_DIBitmap* GetPicture(IFWL_Widget* pWidget) = 0;
-};
+class IFWL_PushButtonDP : public IFWL_DataProvider {};
 
 class IFWL_PushButton : public IFWL_Widget {
  public:
   IFWL_PushButton(const IFWL_App* app,
                   std::unique_ptr<CFWL_WidgetProperties> properties);
   ~IFWL_PushButton() override;
 
   // IFWL_Widget
   FWL_Type GetClassID() const override;
   void GetWidgetRect(CFX_RectF& rect, bool bAutoSize = false) override;
@@ skipping 22 matching lines @@
   void OnKeyDown(CFWL_MsgKey* pMsg);
 
   CFX_RectF m_rtClient;
   CFX_RectF m_rtCaption;
   bool m_bBtnDown;
   uint32_t m_dwTTOStyles;
   int32_t m_iTTOAlign;
 };
 
 #endif  // XFA_FWL_CORE_IFWL_PUSHBUTTON_H_