Cleanup remaining IFWL files for visiblity and usage.

xfa/fwl/core/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/core/cfwl_picturebox.h"
 
 #include <memory>
 
@@ skipping 96 matching lines @@
 }
 
 CFX_DIBitmap* CFWL_PictureBox::GetInitialPicture(IFWL_Widget* pWidget) {
   return m_pBitmap;
 }
 
 int32_t CFWL_PictureBox::GetOpacity(IFWL_Widget* pWidget) {
   return m_iOpacity;
 }
 
-FWL_Error CFWL_PictureBox::GetMatrix(IFWL_Widget* pWidget, CFX_Matrix& matrix) {
+void CFWL_PictureBox::GetMatrix(IFWL_Widget* pWidget, CFX_Matrix& matrix) {
   CFX_RectF rect;
   pWidget->GetClientRect(rect);
   FX_FLOAT fLen = rect.width / 2;
   FX_FLOAT fWid = rect.height / 2;
   matrix.SetIdentity();
   matrix.Translate(-fLen, -fWid);
   matrix.Rotate(m_fRotation);
   matrix.Translate(fLen, fWid);
   matrix.Scale(m_fScaleX, m_fScaleY);
   matrix.Translate(m_fOffSetX, m_fOffSetY);
-  return FWL_Error::Succeeded;
 }
 
 int32_t CFWL_PictureBox::GetFlipMode(IFWL_Widget* pWidget) {
   return m_iFlipMode;
 }