More FWL interface cleanup.

xfa/fwl/core/cfwl_themepart.h

 // Copyright 2016 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_CFWL_THEMEPART_H_
 #define XFA_FWL_CORE_CFWL_THEMEPART_H_
 
 #include "core/fxcrt/include/fx_coordinates.h"
 #include "core/fxcrt/include/fx_system.h"
-#include "xfa/fwl/core/ifwl_widget.h"
 
 enum class CFWL_Part {
   None = 0,
 
   BackArrow,
   Background,
   Border,
   Caption,
   Check,
   CheckBox,
@@ skipping 48 matching lines @@
   CFWL_PartState_Hovered = 1 << 7,
   CFWL_PartState_Inactive = 1 << 8,
   CFWL_PartState_Neutral = 1 << 9,
   CFWL_PartState_Pressed = 1 << 10,
   CFWL_PartState_ReadOnly = 1 << 11,
   CFWL_PartState_LSelected = 1 << 12,
   CFWL_PartState_RSelected = 1 << 13,
   CFWL_PartState_Selected = 1 << 14
 };
 
+class IFWL_Widget;
+
 class CFWL_ThemePart {
  public:
   CFWL_ThemePart()
       : m_pWidget(nullptr),
         m_iPart(CFWL_Part::None),
         m_dwStates(CFWL_PartState_Normal),
         m_dwData(0),
         m_pData(nullptr) {
     m_rtPart.Reset();
     m_matrix.SetIdentity();
   }
 
   CFX_Matrix m_matrix;
   CFX_RectF m_rtPart;
   IFWL_Widget* m_pWidget;
   CFWL_Part m_iPart;
   uint32_t m_dwStates;
   uint32_t m_dwData;
   void* m_pData;
 };
 
 #endif  // XFA_FWL_CORE_CFWL_THEMEPART_H_