Cleanup CFWL_Widget code to return CFX_RectFs where appropriate

xfa/fwl/cfwl_comboedit.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/cfwl_comboedit.h"
 
 #include <memory>
 #include <utility>
 
 #include "xfa/fde/cfde_txtedtengine.h"
 #include "xfa/fwl/cfwl_combobox.h"
 #include "xfa/fwl/cfwl_messagemouse.h"
 
 CFWL_ComboEdit::CFWL_ComboEdit(
     const CFWL_App* app,
     std::unique_ptr<CFWL_WidgetProperties> properties,
     CFWL_Widget* pOuter)
     : CFWL_Edit(app, std::move(properties), pOuter) {
   m_pOuter = static_cast<CFWL_ComboBox*>(pOuter);
 }
 
 void CFWL_ComboEdit::ClearSelected() {
   ClearSelections();
-  Repaint(&GetRTClient());
+  RepaintRect(GetRTClient());
 }
 
 void CFWL_ComboEdit::SetSelected() {
   FlagFocus(true);
   GetTxtEdtEngine()->MoveCaretPos(MC_End);
   AddSelRange(0);
 }
 
 void CFWL_ComboEdit::FlagFocus(bool bSet) {
   if (bSet) {
@@ skipping 29 matching lines @@
         m_pOuter->SetFocus(true);
       }
       break;
     }
     default:
       break;
   }
   if (backDefault)
     CFWL_Edit::OnProcessMessage(pMessage);
 }