Cleanup CFWL_Widget code to return CFX_RectFs where appropriate

xfa/fwl/cfwl_picturebox.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/cfwl_picturebox.h"
 
 #include <memory>
 
@@ skipping 11 matching lines @@
 FWL_Type CFWL_PictureBox::GetClassID() const {
   return FWL_Type::PictureBox;
 }
 
 void CFWL_PictureBox::Update() {
   if (IsLocked())
     return;
   if (!m_pProperties->m_pThemeProvider)
     m_pProperties->m_pThemeProvider = GetAvailableTheme();
 
-  GetClientRect(m_rtClient);
+  m_rtClient = GetClientRect();
 }
 
 void CFWL_PictureBox::DrawWidget(CFX_Graphics* pGraphics,
                                  const CFX_Matrix* pMatrix) {
   if (!pGraphics)
     return;
   if (!m_pProperties->m_pThemeProvider)
     return;
 
   IFWL_ThemeProvider* pTheme = GetAvailableTheme();
   if (HasBorder())
     DrawBorder(pGraphics, CFWL_Part::Border, pTheme, pMatrix);
   if (HasEdge())
     DrawEdge(pGraphics, CFWL_Part::Edge, pTheme, pMatrix);
 }
 
 void CFWL_PictureBox::OnDrawWidget(CFX_Graphics* pGraphics,
                                    const CFX_Matrix* pMatrix) {
   DrawWidget(pGraphics, pMatrix);
 }