Remove CFX_PtrList from renderer main loop.

core/src/fpdfapi/fpdf_render/fpdf_render_text.cpp

Index: core/src/fpdfapi/fpdf_render/fpdf_render_text.cpp
diff --git a/core/src/fpdfapi/fpdf_render/fpdf_render_text.cpp b/core/src/fpdfapi/fpdf_render/fpdf_render_text.cpp
index 7e2c0bd0fdbdcc98e2e2007acb05edfe6ba496c1..578367432d35e5d2347bf0b4ac3a57042fea5d21 100644
--- a/core/src/fpdfapi/fpdf_render/fpdf_render_text.cpp
+++ b/core/src/fpdfapi/fpdf_render/fpdf_render_text.cpp
@@ -316,11 +316,10 @@ FX_BOOL CPDF_Type3Char::LoadBitmap(CPDF_RenderContext* pContext) {
   if (m_pBitmap || !m_pForm) {
     return TRUE;
   }
-  if (m_pForm->GetPageObjectList()->GetCount() == 1 && !m_bColored) {
-    CPDF_PageObject* pPageObj = m_pForm->GetPageObjectList()->GetObjectAt(
-        m_pForm->GetPageObjectList()->GetHeadPosition());
+  if (m_pForm->GetPageObjectList()->size() == 1 && !m_bColored) {
+    auto& pPageObj = m_pForm->GetPageObjectList()->front();
     if (pPageObj->m_Type == CPDF_PageObject::IMAGE) {
-      CPDF_ImageObject* pImage = (CPDF_ImageObject*)pPageObj;
+      CPDF_ImageObject* pImage = static_cast<CPDF_ImageObject*>(pPageObj.get());
       m_ImageMatrix = pImage->m_Matrix;
       const CFX_DIBSource* pSource = pImage->m_pImage->LoadDIBSource();
       if (pSource) {