Remove unused m_bFirstLayer in CPDF_RenderContext.

core/fpdfapi/fpdf_render/fpdf_render.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 "core/fpdfapi/fpdf_render/render_int.h"
 
 #include "core/fpdfapi/fpdf_font/cpdf_type3char.h"
 #include "core/fpdfapi/fpdf_font/cpdf_type3font.h"
@@ skipping 907 matching lines @@
         bStroke ? pSrcStates->m_ColorState.GetObject()->m_StrokeRGB
                 : pSrcStates->m_ColorState.GetObject()->m_FillRGB;
     pColorData->m_StrokeRGB = pColorData->m_FillRGB;
   }
   return pStates;
 }
 
 CPDF_RenderContext::CPDF_RenderContext(CPDF_Page* pPage)
     : m_pDocument(pPage->m_pDocument),
       m_pPageResources(pPage->m_pPageResources),
-      m_pPageCache(pPage->GetRenderCache()),
-      m_bFirstLayer(TRUE) {}
+      m_pPageCache(pPage->GetRenderCache()) {}
 
 CPDF_RenderContext::CPDF_RenderContext(CPDF_Document* pDoc,
                                        CPDF_PageRenderCache* pPageCache)
-    : m_pDocument(pDoc),
-      m_pPageResources(nullptr),
-      m_pPageCache(pPageCache),
-      m_bFirstLayer(TRUE) {}
+    : m_pDocument(pDoc), m_pPageResources(nullptr), m_pPageCache(pPageCache) {}
 
 CPDF_RenderContext::~CPDF_RenderContext() {}
 
 void CPDF_RenderContext::AppendLayer(CPDF_PageObjectHolder* pObjectHolder,
                                      const CFX_Matrix* pObject2Device) {
   Layer* pLayer = m_Layers.AddSpace();
   pLayer->m_pObjectHolder = pObjectHolder;
   if (pObject2Device) {
     pLayer->m_Matrix = *pObject2Device;
   } else {
@@ skipping 346 matching lines @@
     m_pDevice->StretchDIBits(m_pBitmapDevice->GetBitmap(), m_Rect.left,
                              m_Rect.top, m_Rect.Width(), m_Rect.Height());
   }
 }
 
 #if defined _SKIA_SUPPORT_
 void CPDF_RenderStatus::DebugVerifyDeviceIsPreMultiplied() const {
   m_pDevice->DebugVerifyBitmapIsPreMultiplied();
 }
 #endif