Change _PDF_RenderItem to CPDF_RenderContext::Layer.

core/src/fpdfapi/fpdf_render/render_int.h

Index: core/src/fpdfapi/fpdf_render/render_int.h
diff --git a/core/src/fpdfapi/fpdf_render/render_int.h b/core/src/fpdfapi/fpdf_render/render_int.h
index 3a81ba55877d9afc571d93a558053e64ea09eda2..d5018adfa77fdad0089df283840deb30a1e83b80 100644
--- a/core/src/fpdfapi/fpdf_render/render_int.h
+++ b/core/src/fpdfapi/fpdf_render/render_int.h
@@ -91,13 +91,6 @@ class CPDF_DocRenderData {
   CPDF_Type3CacheMap m_Type3FaceMap;
   CPDF_TransferFuncMap m_TransferFuncMap;
 };
-struct _PDF_RenderItem {
- public:
-  CPDF_PageObjectList* m_pObjectList;
-  CFX_Matrix m_Matrix;
-};
-
-typedef CFX_ArrayTemplate<_PDF_RenderItem> CPDF_RenderLayer;
 
 class IPDF_ObjectRenderer {
  public: