Revert of Remove CPDF_Object::Release() in favor of direct delete

fpdfsdk/fpdfppo.cpp

Index: fpdfsdk/fpdfppo.cpp
diff --git a/fpdfsdk/fpdfppo.cpp b/fpdfsdk/fpdfppo.cpp
index ccfd141db2db9f648a2554a25312c6766b5dc561..22b23d1db1e5e454e76a942803428aac187f0b60 100644
--- a/fpdfsdk/fpdfppo.cpp
+++ b/fpdfsdk/fpdfppo.cpp
@@ -285,11 +285,11 @@
     if (pDictClone->KeyExist("Type")) {
       CFX_ByteString strType = pDictClone->GetStringFor("Type");
       if (!FXSYS_stricmp(strType.c_str(), "Pages")) {
-        delete pDictClone;
+        pDictClone->Release();
         return 4;
       }
       if (!FXSYS_stricmp(strType.c_str(), "Page")) {
-        delete pDictClone;
+        pDictClone->Release();
         return 0;
       }
     }
@@ -297,7 +297,7 @@
   dwNewObjNum = pDoc->AddIndirectObject(pClone);
   (*pObjNumberMap)[dwObjnum] = dwNewObjNum;
   if (!UpdateReference(pClone, pDoc, pObjNumberMap)) {
-    delete pClone;
+    pClone->Release();
     return 0;
   }
   return dwNewObjNum;