Revert "Make CPDF_IndirectObjectHolder use unique_ptr to objects"

core/fpdfapi/fpdf_parser/cfdf_document.cpp

Index: core/fpdfapi/fpdf_parser/cfdf_document.cpp
diff --git a/core/fpdfapi/fpdf_parser/cfdf_document.cpp b/core/fpdfapi/fpdf_parser/cfdf_document.cpp
index 92b20cafd83f83c9101a7ef826ec185d73a0fb69..01829481730f2acccbf8f56170468c190c29ce13 100644
--- a/core/fpdfapi/fpdf_parser/cfdf_document.cpp
+++ b/core/fpdfapi/fpdf_parser/cfdf_document.cpp
@@ -90,8 +90,7 @@ FX_BOOL CFDF_Document::WriteBuf(CFX_ByteTextBuf& buf) const {
 
   buf << "%FDF-1.2\r\n";
   for (const auto& pair : *this)
-    buf << pair.first << " 0 obj\r\n"
-        << pair.second.get() << "\r\nendobj\r\n\r\n";
+    buf << pair.first << " 0 obj\r\n" << pair.second << "\r\nendobj\r\n\r\n";
 
   buf << "trailer\r\n<</Root " << m_pRootDict->GetObjNum()
       << " 0 R>>\r\n%%EOF\r\n";