Remove some FWL code.

xfa/fwl/basewidget/ifwl_spinbutton.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_BASEWIDGET_IFWL_SPINBUTTON_H_
 #define XFA_FWL_BASEWIDGET_IFWL_SPINBUTTON_H_
 
 #include "xfa/fwl/core/fwl_widgetimp.h"
 
 #define FWL_CLASS_SpinButton L"FWL_SPINBUTTON"
 #define FWL_CLASSHASH_SpinButton 3793043646
 #define FWL_STYLEEXE_SPB_Vert (1L << 0)
 #define FWL_PART_SPB_Border 1
 #define FWL_PART_SPB_Edge 2
 #define FWL_PART_SPB_UpButton 3
 #define FWL_PART_SPB_DownButton 4
 #define FWL_PARTSTATE_SPB_Normal (0L << 0)
 #define FWL_PARTSTATE_SPB_Hovered (1L << 0)
 #define FWL_PARTSTATE_SPB_Pressed (2L << 0)
 #define FWL_PARTSTATE_SPB_Disabled (3L << 0)
 #define FWL_WGTHITTEST_SPB_UpButton (FWL_WGTHITTEST_MAX + 1)
 #define FWL_WGTHITTEST_SPB_DownButton (FWL_WGTHITTEST_MAX + 2)
-#define FWL_EVT_SPB_Click L"FWL_EVENT_SPB_Click"
+// TODO(dsinclair): Event hash is hash of string, cleanup. pdfium:474
 #define FWL_EVTHASH_SPB_Click 2927651187
 
 BEGIN_FWL_EVENT_DEF(CFWL_EvtSpbClick, FWL_EVTHASH_SPB_Click)
 FX_BOOL m_bUp;
 END_FWL_EVENT_DEF
 
 class IFWL_SpinButton : public IFWL_Widget {
  public:
   static IFWL_SpinButton* Create(const CFWL_WidgetImpProperties& properties,
                                  IFWL_Widget* pOuter);
 
   FWL_ERR EnableButton(FX_BOOL bEnable, FX_BOOL bUp = TRUE);
   FX_BOOL IsButtonEnable(FX_BOOL bUp = TRUE);
 
  protected:
   IFWL_SpinButton();
 };
 
 #endif  // XFA_FWL_BASEWIDGET_IFWL_SPINBUTTON_H_