Kill Func_Renderpage global function pointer, it never changes.

fpdfsdk/src/fpdf_progressive.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 "../../public/fpdf_progressive.h"
 #include "../../public/fpdfview.h"
 #include "../include/fsdk_define.h"
 #include "../include/fsdk_rendercontext.h"
 
-extern void (*Func_RenderPage)( CRenderContext*, FPDF_PAGE page, int start_x, int start_y, int size_x, int size_y,
-                                                int rotate, int flags,FX_BOOL bNeedToRestore, IFSDK_PAUSE_Adapter * pause );
-
-extern void DropContext(void* data);
-
 DLLEXPORT int STDCALL FPDF_RenderPageBitmap_Start( FPDF_BITMAP bitmap, FPDF_PAGE page,
                                                                                                         int start_x, int start_y, int size_x,
                                                                                                     int size_y, int rotate, int flags,
                                                                                                         IFSDK_PAUSE * pause )
 {
         if (bitmap == NULL || page == NULL)
                 return FPDF_RENDER_FAILED;
 
         if (!pause)
                 return FPDF_RENDER_FAILED;
@@ skipping 12 matching lines @@
                 ((CFX_SkiaDevice*)pContext->m_pDevice)->Attach((CFX_DIBitmap*)bitmap);
 #else
         pContext->m_pDevice = new CFX_FxgeDevice;
         if (flags & FPDF_REVERSE_BYTE_ORDER)
                 ((CFX_FxgeDevice*)pContext->m_pDevice)->Attach((CFX_DIBitmap*)bitmap,0,TRUE);
         else
                 ((CFX_FxgeDevice*)pContext->m_pDevice)->Attach((CFX_DIBitmap*)bitmap);
 #endif
         IFSDK_PAUSE_Adapter IPauseAdapter(pause);
 
-        Func_RenderPage(pContext, page, start_x, start_y, size_x, size_y, rotate, flags,FALSE, &IPauseAdapter);
+    FPDF_RenderPage_Retail(pContext, page, start_x, start_y, size_x, size_y,
+                           rotate, flags,FALSE, &IPauseAdapter);
 
         if ( pContext->m_pRenderer )
         {
                 CPDF_ProgressiveRenderer::RenderStatus status = CPDF_ProgressiveRenderer::Failed;
                 status = pContext->m_pRenderer->GetStatus();
                 return status;
         }
         return FPDF_RENDER_FAILED;
 }
 
@@ skipping 35 matching lines @@
 
         CRenderContext * pContext = (CRenderContext*)pPage->GetPrivateData((void*)1);
         if (pContext)
         {
                 pContext->m_pDevice->RestoreState();
                 delete pContext;
                 pPage->RemovePrivateData((void*)1);
         }
 }