Remove include only fwl.h and IWYU.

xfa/include/fwl/basewidget/fwl_picturebox.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_PICTUREBOX_H_
 #define XFA_INCLUDE_FWL_BASEWIDGET_FWL_PICTUREBOX_H_
 
-class CFWL_WidgetImpProperties;
-class IFWL_Widget;
-class IFWL_PictureBoxDP;
-class IFWL_PictureBox;
+#include "xfa/src/fwl/src/core/include/fwl_widgetimp.h"
+
 #define FWL_CLASS_PictureBox L"FWL_PICTUREBOX"
 #define FWL_CLASSHASH_PictureBox 2974721741
 #define FWL_STYLEEXT_PTB_Left 0L << 0
 #define FWL_STYLEEXT_PTB_Center 1L << 0
 #define FWL_STYLEEXT_PTB_Right 2L << 0
 #define FWL_STYLEEXT_PTB_Top 0L << 2
 #define FWL_STYLEEXT_PTB_Vcenter 1L << 2
 #define FWL_STYLEEXT_PTB_Bottom 2L << 2
 #define FWL_STYLEEXT_PTB_Normal 0L << 4
 #define FWL_STYLEEXT_PTB_AutoSize 1L << 4
 #define FWL_STYLEEXT_PTB_StretchImage 2L << 4
 #define FWL_STYLEEXT_PTB_StretchHImage 3L << 4
 #define FWL_STYLEEXT_PTB_StretchVImage 4L << 4
 #define FWL_STYLEEXT_PTB_HAlignMask 3L << 0
 #define FWL_STYLEEXT_PTB_VAlignMask 3L << 2
 #define FWL_STYLEEXT_PTB_StretchAlignMask 7L << 4
 #define FWL_PART_PTB_Border 1
 #define FWL_PART_PTB_Edge 2
 #define FWL_PART_PTB_Image 3
 #define FWL_PARTSTATE_PTB_Normal (0L << 0)
 #define FWL_PARTSTATE_PTB_Disabled (1L << 0)
+
 class IFWL_PictureBoxDP : public IFWL_DataProvider {
  public:
   virtual CFX_DIBitmap* GetPicture(IFWL_Widget* pWidget) = 0;
   virtual CFX_DIBitmap* GetErrorPicture(IFWL_Widget* pWidget) = 0;
   virtual CFX_DIBitmap* GetInitialPicture(IFWL_Widget* pWidget) = 0;
   virtual int32_t GetOpacity(IFWL_Widget* pWidget) = 0;
   virtual int32_t GetFlipMode(IFWL_Widget* pWidget) = 0;
   virtual FWL_ERR GetMatrix(IFWL_Widget* pWidget, CFX_Matrix& matrix) = 0;
 };
 
 class IFWL_PictureBox : public IFWL_Widget {
  public:
   static IFWL_PictureBox* Create(const CFWL_WidgetImpProperties& properties,
                                  IFWL_Widget* pOuter);
 
  protected:
   IFWL_PictureBox();
 };
 
 #endif  // XFA_INCLUDE_FWL_BASEWIDGET_FWL_PICTUREBOX_H_