Convert GetWidgetRect to return rect.

xfa/fwl/core/cfwl_comboboxproxy.cpp

 // Copyright 2016 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/core/cfwl_comboboxproxy.h"
 
 #include <memory>
 #include <utility>
@@ skipping 52 matching lines @@
   m_pComboBox->DrawStretchHandler(pGraphics, pMatrix);
 }
 
 void CFWL_ComboBoxProxy::OnLButtonDown(CFWL_Message* pMessage) {
   const CFWL_App* pApp = GetOwnerApp();
   if (!pApp)
     return;
 
   CFWL_NoteDriver* pDriver =
       static_cast<CFWL_NoteDriver*>(pApp->GetNoteDriver());
-  CFX_RectF rtWidget;
-  GetWidgetRect(rtWidget, false);
+  CFX_RectF rtWidget = GetWidgetRect();
   rtWidget.left = rtWidget.top = 0;
 
   CFWL_MsgMouse* pMsg = static_cast<CFWL_MsgMouse*>(pMessage);
   if (rtWidget.Contains(pMsg->m_fx, pMsg->m_fy)) {
     m_bLButtonDown = true;
     pDriver->SetGrab(this, true);
   } else {
     m_bLButtonDown = false;
     pDriver->SetGrab(this, false);
     m_pComboBox->ShowDropList(false);
   }
 }
 
 void CFWL_ComboBoxProxy::OnLButtonUp(CFWL_Message* pMessage) {
   m_bLButtonDown = false;
   const CFWL_App* pApp = GetOwnerApp();
   if (!pApp)
     return;
 
   CFWL_NoteDriver* pDriver =
       static_cast<CFWL_NoteDriver*>(pApp->GetNoteDriver());
   pDriver->SetGrab(this, false);
   if (!m_bLButtonUpSelf) {
     m_bLButtonUpSelf = true;
     return;
   }
 
   CFWL_MsgMouse* pMsg = static_cast<CFWL_MsgMouse*>(pMessage);
-  CFX_RectF rect;
-  GetWidgetRect(rect, false);
+  CFX_RectF rect = GetWidgetRect();
   rect.left = rect.top = 0;
   if (!rect.Contains(pMsg->m_fx, pMsg->m_fy) &&
       m_pComboBox->IsDropListVisible()) {
     m_pComboBox->ShowDropList(false);
   }
 }
 
 void CFWL_ComboBoxProxy::OnFocusChanged(CFWL_Message* pMessage, bool bSet) {
   if (bSet)
     return;
 
   CFWL_MsgKillFocus* pMsg = static_cast<CFWL_MsgKillFocus*>(pMessage);
   if (!pMsg->m_pSetFocus)
     m_pComboBox->ShowDropList(false);
 }