Remove include only fwl.h and IWYU.

xfa/include/fwl/basewidget/fwl_checkbox.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_CHECKBOX_H_
 #define XFA_INCLUDE_FWL_BASEWIDGET_FWL_CHECKBOX_H_
 
-class CFWL_WidgetImpProperties;
-class IFWL_Widget;
-class IFWL_CheckBoxDP;
-class IFWL_CheckBox;
+#include "xfa/include/fwl/core/fwl_note.h"
+#include "xfa/include/fwl/core/fwl_widget.h"
+
 #define FWL_CLASS_CheckBox L"FWL_CHECKBOX"
 #define FWL_CLASSHASH_CheckBox 4107183823
 #define FWL_STYLEEXT_CKB_Left (0L << 0)
 #define FWL_STYLEEXT_CKB_Center (1L << 0)
 #define FWL_STYLEEXT_CKB_Right (2L << 0)
 #define FWL_STYLEEXT_CKB_Top (0L << 2)
 #define FWL_STYLEEXT_CKB_VCenter (1L << 2)
 #define FWL_STYLEEXT_CKB_Bottom (2L << 2)
 #define FWL_STYLEEXT_CKB_LeftText (1L << 4)
 #define FWL_STYLEEXT_CKB_MultiLine (1L << 5)
@@ skipping 29 matching lines @@
 #define FWL_PARTSTATE_CKB_Hovered (2L << 0)
 #define FWL_PARTSTATE_CKB_Disabled (3L << 0)
 #define FWL_PARTSTATE_CKB_UnChecked (0L << 2)
 #define FWL_PARTSTATE_CKB_Checked (1L << 2)
 #define FWL_PARTSTATE_CKB_Neutral (2L << 2)
 #define FWL_PARTSTATE_CKB_Focused (1L << 4)
 #define FWL_PARTSTATE_CKB_Mask1 (3L << 0)
 #define FWL_PARTSTATE_CKB_Mask2 (3L << 2)
 #define FWL_EVT_CKB_CheckStateChanged L"FWL_EVENT_CKB_CheckStateChanged"
 #define FWL_EVTHASH_CKB_CheckStateChanged 2503252963
+
 BEGIN_FWL_EVENT_DEF(CFWL_EvtCkbCheckStateChanged,
                     FWL_EVTHASH_CKB_CheckStateChanged)
 END_FWL_EVENT_DEF
 class IFWL_CheckBoxDP : public IFWL_DataProvider {
  public:
   virtual FX_FLOAT GetBoxSize(IFWL_Widget* pWidget) = 0;
 };
 
 class IFWL_CheckBox : public IFWL_Widget {
  public:
   static IFWL_CheckBox* Create(const CFWL_WidgetImpProperties& properties,
                                IFWL_Widget* pOuter);
   int32_t GetCheckState();
   FWL_ERR SetCheckState(int32_t iCheck);
 
  protected:
   IFWL_CheckBox();
 };
 
 #endif  // XFA_INCLUDE_FWL_BASEWIDGET_FWL_CHECKBOX_H_