Cleanup remaining IFWL files for visiblity and usage.

xfa/fwl/core/ifwl_picturebox.h

 // 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
 
 #ifndef XFA_FWL_CORE_IFWL_PICTUREBOX_H_
 #define XFA_FWL_CORE_IFWL_PICTUREBOX_H_
 
 #include "xfa/fwl/core/cfwl_widgetproperties.h"
@@ skipping 18 matching lines @@
 class CFX_DIBitmap;
 class IFWL_Widget;
 
 class IFWL_PictureBoxDP : public IFWL_DataProvider {
  public:
   virtual CFX_DIBitmap* GetPicture(IFWL_Widget* pWidget) = 0;
   virtual CFX_DIBitmap* GetErrorPicture(IFWL_Widget* pWidget) = 0;
   virtual CFX_DIBitmap* GetInitialPicture(IFWL_Widget* pWidget) = 0;
   virtual int32_t GetOpacity(IFWL_Widget* pWidget) = 0;
   virtual int32_t GetFlipMode(IFWL_Widget* pWidget) = 0;
-  virtual FWL_Error GetMatrix(IFWL_Widget* pWidget, CFX_Matrix& matrix) = 0;
+  virtual void GetMatrix(IFWL_Widget* pWidget, CFX_Matrix& matrix) = 0;
 };
 
 class IFWL_PictureBox : public IFWL_Widget {
  public:
   explicit IFWL_PictureBox(const IFWL_App* app,
                            std::unique_ptr<CFWL_WidgetProperties> properties);
   ~IFWL_PictureBox() override;
 
   // IFWL_Widget
   FWL_Type GetClassID() const override;
   void GetWidgetRect(CFX_RectF& rect, bool bAutoSize = false) override;
   void Update() override;
   void DrawWidget(CFX_Graphics* pGraphics,
                   const CFX_Matrix* pMatrix = nullptr) override;
   void OnDrawWidget(CFX_Graphics* pGraphics,
                     const CFX_Matrix* pMatrix) override;
 
  private:
   void DrawBkground(CFX_Graphics* pGraphics,
                     IFWL_ThemeProvider* pTheme,
                     const CFX_Matrix* pMatrix = nullptr);
 
   CFX_RectF m_rtClient;
   CFX_RectF m_rtImage;
   CFX_Matrix m_matrix;
 };
 
 #endif  // XFA_FWL_CORE_IFWL_PICTUREBOX_H_