Revert "Revert "Add type cast definitions for CPDF_Dictionary.""

fpdfsdk/src/fpdf_flatten.cpp

Index: fpdfsdk/src/fpdf_flatten.cpp
diff --git a/fpdfsdk/src/fpdf_flatten.cpp b/fpdfsdk/src/fpdf_flatten.cpp
index b2303f36aa0758f87b9a0e7177a1a5495fbf1800..fee93f2663023cc9735b65a90bf5e11c34378ff3 100644
--- a/fpdfsdk/src/fpdf_flatten.cpp
+++ b/fpdfsdk/src/fpdf_flatten.cpp
@@ -94,11 +94,10 @@ int ParserAnnots(CPDF_Document* pSourceDoc,
 
   FX_DWORD dwSize = pAnnots->GetCount();
   for (int i = 0; i < (int)dwSize; i++) {
-    CPDF_Object* pObj = pAnnots->GetElementValue(i);
-    if (!pObj || pObj->GetType() != PDFOBJ_DICTIONARY)
+    CPDF_Dictionary* pAnnotDic = ToDictionary(pAnnots->GetElementValue(i));
+    if (!pAnnotDic)
       continue;
 
-    CPDF_Dictionary* pAnnotDic = (CPDF_Dictionary*)pObj;
     CFX_ByteString sSubtype = pAnnotDic->GetString("Subtype");
     if (sSubtype == "Popup")
       continue;