Remove CLASSHASH defines in favour of an enum class.

xfa/fwl/lightwidget/cfwl_widget.cpp

 // 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
 
 #include "xfa/fwl/lightwidget/cfwl_widget.h"
 
 #include "xfa/fde/tto/fde_textout.h"
 #include "xfa/fwl/core/cfwl_themetext.h"
@@ skipping 11 matching lines @@
 IFWL_Widget* CFWL_Widget::GetWidget() {
   return m_pIface;
 }
 
 FWL_Error CFWL_Widget::GetClassName(CFX_WideString& wsClass) const {
   if (!m_pIface)
     return FWL_Error::Indefinite;
   return m_pIface->GetClassName(wsClass);
 }
 
-uint32_t CFWL_Widget::GetClassID() const {
+FWL_Type CFWL_Widget::GetClassID() const {
   if (!m_pIface)
-    return 0;
+    return FWL_Type::Unknown;
   return m_pIface->GetClassID();
 }
 
 FX_BOOL CFWL_Widget::IsInstance(const CFX_WideStringC& wsClass) const {
   if (!m_pIface)
     return FALSE;
   return m_pIface->IsInstance(wsClass);
 }
 
 static void* gs_pFWLWidget = (void*)FXBSTR_ID('l', 'i', 'g', 't');
@@ skipping 289 matching lines @@
   calPart.m_iTTOAlign = FDE_TTOALIGNMENT_TopLeft;
   CFX_RectF rect;
   FX_FLOAT fWidth = bMultiLine
                         ? (iLineWidth > 0 ? (FX_FLOAT)iLineWidth
                                           : FWL_WGT_CalcMultiLineDefWidth)
                         : FWL_WGT_CalcWidth;
   rect.Set(0, 0, fWidth, FWL_WGT_CalcHeight);
   pTheme->CalcTextRect(&calPart, rect);
   return CFX_SizeF(rect.width, rect.height);
 }