Remove CLASSHASH defines in favour of an enum class.

xfa/fwl/core/ifwl_form.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_CORE_IFWL_FORM_H_
 #define XFA_FWL_CORE_IFWL_FORM_H_
 
 #include "xfa/fwl/core/ifwl_dataprovider.h"
 #include "xfa/fwl/core/ifwl_widget.h"
 #include "core/fxcrt/include/fx_system.h"
 #include "xfa/fwl/core/cfwl_widgetimpproperties.h"
 
 #define FWL_CLASS_Form L"FWL_FORM"
-#define FWL_CLASSHASH_Form 881567292
 #define FWL_CLASS_FormProxy L"FWL_FORMPROXY"
-#define FWL_CLASSHASH_FormProxy 881567291
 #define FWL_STYLEEXT_FRM_Resize (1L << 0)
 #define FWL_STYLEEXT_FRM_NativeBorder (1L << 1)
 #define FWL_STYLEEXT_FRM_RoundCorner (2L << 1)
 #define FWL_STYLEEXT_FRM_RoundCorner4 (3L << 1)
 #define FWL_STYLEEXT_FRM_NoDrawClient (1L << 3)
 #define FWL_STYLEEXT_FRM_BorderCornerMask (3L << 1)
 #define FWL_STYLEEXT_FRM_Max (3)
 
 #if (_FX_OS_ == _FX_MACOSX_)
 #define FWL_UseMacSystemBorder
@@ skipping 28 matching lines @@
   IFWL_Widget* DoModal();
   IFWL_Widget* DoModal(uint32_t& dwCommandID);
   FWL_Error EndDoModal();
   FWL_Error SetBorderRegion(CFX_Path* pPath);
 
  protected:
   IFWL_Form();
 };
 
 #endif  // XFA_FWL_CORE_IFWL_FORM_H_