Land all the fixes from 5609f39c but don't enable assert

core/fpdfapi/parser/cpdf_dictionary.cpp

Index: core/fpdfapi/parser/cpdf_dictionary.cpp
diff --git a/core/fpdfapi/parser/cpdf_dictionary.cpp b/core/fpdfapi/parser/cpdf_dictionary.cpp
index 7ef5a5355141ac8e00187bdb2aec80f389c7d0ec..31f520af0de82771ca77f39d48702f0a91c2a2e7 100644
--- a/core/fpdfapi/parser/cpdf_dictionary.cpp
+++ b/core/fpdfapi/parser/cpdf_dictionary.cpp
@@ -30,7 +30,7 @@ CPDF_Dictionary::~CPDF_Dictionary() {
   // in case of cyclic references.
   m_ObjNum = kInvalidObjNum;
   for (const auto& it : m_Map) {
-    if (it.second)
+    if (it.second && it.second->GetObjNum() != kInvalidObjNum)
       it.second->Release();
   }
 }