Remove FWL_WGTHITTEST_* defines in favour of enum class.

xfa/fxfa/app/xfa_ffsignature.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/fxfa/app/xfa_ffsignature.h"
 
 #include "xfa/fxfa/app/xfa_fffield.h"
 #include "xfa/fxfa/include/xfa_ffdoc.h"
@@ skipping 78 matching lines @@
 }
 FX_BOOL CXFA_FFSignature::OnKeyDown(uint32_t dwKeyCode, uint32_t dwFlags) {
   return FALSE;
 }
 FX_BOOL CXFA_FFSignature::OnKeyUp(uint32_t dwKeyCode, uint32_t dwFlags) {
   return FALSE;
 }
 FX_BOOL CXFA_FFSignature::OnChar(uint32_t dwChar, uint32_t dwFlags) {
   return FALSE;
 }
-uint32_t CXFA_FFSignature::OnHitTest(FX_FLOAT fx, FX_FLOAT fy) {
+FWL_WidgetHit CXFA_FFSignature::OnHitTest(FX_FLOAT fx, FX_FLOAT fy) {
   if (m_pNormalWidget) {
     FX_FLOAT ffx = fx, ffy = fy;
     FWLToClient(ffx, ffy);
-    uint32_t dwWidgetHit = m_pNormalWidget->HitTest(ffx, ffy);
-    if (dwWidgetHit != FWL_WGTHITTEST_Unknown) {
-      return FWL_WGTHITTEST_Client;
-    }
+    if (m_pNormalWidget->HitTest(ffx, ffy) != FWL_WidgetHit::Unknown)
+      return FWL_WidgetHit::Client;
   }
   CFX_RectF rtBox;
   GetRectWithoutRotate(rtBox);
-  if (!rtBox.Contains(fx, fy)) {
-    return FWL_WGTHITTEST_Unknown;
-  }
-  if (m_rtCaption.Contains(fx, fy)) {
-    return FWL_WGTHITTEST_Titlebar;
-  }
-  return FWL_WGTHITTEST_Client;
+  if (!rtBox.Contains(fx, fy))
+    return FWL_WidgetHit::Unknown;
+  if (m_rtCaption.Contains(fx, fy))
+    return FWL_WidgetHit::Titlebar;
+  return FWL_WidgetHit::Client;
 }
 FX_BOOL CXFA_FFSignature::OnSetCursor(FX_FLOAT fx, FX_FLOAT fy) {
   return FALSE;
 }