Remove include only fwl.h and IWYU.

xfa/include/fwl/basewidget/fwl_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_INCLUDE_FWL_BASEWIDGET_FWL_PUSHBUTTON_H_
 #define XFA_INCLUDE_FWL_BASEWIDGET_FWL_PUSHBUTTON_H_
 
-class CFWL_WidgetImpProperties;
-class IFWL_Widget;
-class IFWL_PushButtonDP;
-class IFWL_PushButton;
+#include "xfa/include/fwl/core/fwl_theme.h"
+#include "xfa/src/fwl/src/core/include/fwl_widgetimp.h"
+
 #define FWL_CLASS_PushButton L"FWL_PUSHBUTTON"
 #define FWL_CLASSHASH_PushButton 3521614244
 #define FWL_STYLEEXT_PSB_Left (0L << 0)
 #define FWL_STYLEEXT_PSB_Center (1L << 0)
 #define FWL_STYLEEXT_PSB_Right (2L << 0)
 #define FWL_STYLEEXT_PSB_Top (0L << 2)
 #define FWL_STYLEEXT_PSB_VCenter (1L << 2)
 #define FWL_STYLEEXT_PSB_Bottom (2L << 2)
 #define FWL_STYLEEXT_PSB_TextOnly (0L << 4)
 #define FWL_STYLEEXT_PSB_IconOnly (1L << 4)
 #define FWL_STYLEEXT_PSB_TextIcon (2L << 4)
 #define FWL_STYLEEXT_PSB_HLayoutMask (3L << 0)
 #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))
 #define FWL_WGTCAPACITY_PSB_Margin (FWL_WGTCAPACITY_MAX + 1)
 #define FWL_PART_PSB_Border 1
 #define FWL_PART_PSB_Edge 2
 #define FWL_PART_PSB_Background 3
 #define FWL_PART_PSB_Caption 4
 #define FWL_PARTSTATE_PSB_Normal (0L << 0)
 #define FWL_PARTSTATE_PSB_Pressed (1L << 0)
 #define FWL_PARTSTATE_PSB_Hovered (2L << 0)
 #define FWL_PARTSTATE_PSB_Default (3L << 0)
 #define FWL_PARTSTATE_PSB_Disabled (4L << 0)
 #define FWL_PARTSTATE_PSB_Focused (1L << 3)
 #define FWL_PARTSTATE_PSB_Mask (7L << 0)
+
 class IFWL_PushButtonDP : public IFWL_DataProvider {
  public:
   virtual CFX_DIBitmap* GetPicture(IFWL_Widget* pWidget) = 0;
 };
 class IFWL_PushButton : public IFWL_Widget {
  public:
   static IFWL_PushButton* Create(const CFWL_WidgetImpProperties& properties,
                                  IFWL_Widget* pOuter);
 
  protected:
   IFWL_PushButton();
 };
 
 #endif  // XFA_INCLUDE_FWL_BASEWIDGET_FWL_PUSHBUTTON_H_