Make CPDF_Object containers hold objects via unique pointers

fpdfsdk/fpdfppo.cpp

Index: fpdfsdk/fpdfppo.cpp
diff --git a/fpdfsdk/fpdfppo.cpp b/fpdfsdk/fpdfppo.cpp
index f41f904e174bf80c3e17cb252880f2d4bc68dd51..8a46ea4067db55a118df3fc6a47353e745cee908 100644
--- a/fpdfsdk/fpdfppo.cpp
+++ b/fpdfsdk/fpdfppo.cpp
@@ -105,8 +105,8 @@ FX_BOOL CPDF_PageOrganizer::ExportPage(CPDF_Document* pSrcPDFDoc,
     // Clone the page dictionary
     for (const auto& it : *pSrcPageDict) {
       const CFX_ByteString& cbSrcKeyStr = it.first;
-      CPDF_Object* pObj = it.second;
-      if (cbSrcKeyStr.Compare(("Type")) && cbSrcKeyStr.Compare(("Parent"))) {
+      CPDF_Object* pObj = it.second.get();
+      if (cbSrcKeyStr.Compare("Type") && cbSrcKeyStr.Compare("Parent")) {
         if (pCurPageDict->KeyExist(cbSrcKeyStr))
           pCurPageDict->RemoveFor(cbSrcKeyStr);
         pCurPageDict->SetFor(cbSrcKeyStr, pObj->Clone());
@@ -219,7 +219,7 @@ FX_BOOL CPDF_PageOrganizer::UpdateReference(CPDF_Object* pObj,
       auto it = pDict->begin();
       while (it != pDict->end()) {
         const CFX_ByteString& key = it->first;
-        CPDF_Object* pNextObj = it->second;
+        CPDF_Object* pNextObj = it->second.get();
         ++it;
         if (key == "Parent" || key == "Prev" || key == "First")
           continue;