Replace several more CFX_MapPtrToPtr with std::set or std::map

core/include/fpdfdoc/fpdf_doc.h

Index: core/include/fpdfdoc/fpdf_doc.h
diff --git a/core/include/fpdfdoc/fpdf_doc.h b/core/include/fpdfdoc/fpdf_doc.h
index 3dea48d3ed60b31ea1e2f6d53cc51c2a7bd03032..b756ebcaf506cf765e459e25456ae888ec315134 100644
--- a/core/include/fpdfdoc/fpdf_doc.h
+++ b/core/include/fpdfdoc/fpdf_doc.h
@@ -421,12 +421,9 @@ class CPDF_Annot : public CFX_PrivateData {
 
  private:
   CPDF_Dictionary* const m_pAnnotDict;
-
   CPDF_AnnotList* const m_pList;
-
   const CFX_ByteString m_sSubtype;
-
-  CFX_MapPtrToPtr m_APMap;
+  std::map<CPDF_Stream*, CPDF_Form*> m_APMap;
 };
 
 class CPDF_AnnotList {