Update CPDF_IndirectObjectHolder APIs for unique objects

core/fpdfdoc/cpdf_interform.cpp

Index: core/fpdfdoc/cpdf_interform.cpp
diff --git a/core/fpdfdoc/cpdf_interform.cpp b/core/fpdfdoc/cpdf_interform.cpp
index 3bef85ef9ce1b9b85f7724f8efd235f84b8e6041..cafc912569fb3ba2fa1eb99bf5850e0854cede72 100644
--- a/core/fpdfdoc/cpdf_interform.cpp
+++ b/core/fpdfdoc/cpdf_interform.cpp
@@ -59,9 +59,9 @@ void InitDict(CPDF_Dictionary*& pFormDict, CPDF_Document* pDocument) {
     return;
 
   if (!pFormDict) {
-    pFormDict = new CPDF_Dictionary(pDocument->GetByteStringPool());
-    pDocument->GetRoot()->SetReferenceFor(
-        "AcroForm", pDocument, pDocument->AddIndirectObject(pFormDict));
+    pFormDict =
+        pDocument->AddIndirectDictionary(pDocument->GetByteStringPool());
+    pDocument->GetRoot()->SetReferenceFor("AcroForm", pDocument, pFormDict);
   }
 
   CFX_ByteString csDA;
@@ -274,8 +274,7 @@ void AddFont(CPDF_Dictionary*& pFormDict,
   csNameTag.Remove(' ');
   csNameTag = CPDF_InterForm::GenerateNewResourceName(pDR, "Font", 4,
                                                       csNameTag.c_str());
-  pFonts->SetReferenceFor(csNameTag, pDocument,
-                          pFont->GetFontDict()->GetObjNum());
+  pFonts->SetReferenceFor(csNameTag, pDocument, pFont->GetFontDict());
 }
 
 CPDF_Font* AddNativeFont(CPDF_Dictionary*& pFormDict,