Remove FWL_WGTHITTEST_* defines in favour of 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 146 matching lines @@
     return FWL_ERR_Indefinite;
   return m_pIface->LockUpdate();
 }
 
 FWL_ERR CFWL_Widget::UnlockUpdate() {
   if (!m_pIface)
     return FWL_ERR_Indefinite;
   return m_pIface->UnlockUpdate();
 }
 
-uint32_t CFWL_Widget::HitTest(FX_FLOAT fx, FX_FLOAT fy) {
+FWL_WidgetHit CFWL_Widget::HitTest(FX_FLOAT fx, FX_FLOAT fy) {
   if (!m_pIface)
-    return 0;
+    return FWL_WidgetHit::Unknown;
   return m_pIface->HitTest(fx, fy);
 }
 
 FWL_ERR CFWL_Widget::TransformTo(CFWL_Widget* pWidget,
                                  FX_FLOAT& fx,
                                  FX_FLOAT& fy) {
   if (!m_pIface)
     return FWL_ERR_Indefinite;
   return m_pIface->TransformTo(pWidget ? pWidget->GetWidget() : NULL, fx, fy);
 }
@@ skipping 150 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);
 }