Reland "Remove CPDF_Object::Release() in favor of direct delete"

testing/libfuzzer/pdf_hint_table_fuzzer.cc

 // Copyright 2016 The PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <cstdint>
 
 #include "core/fpdfapi/parser/cpdf_dictionary.h"
 #include "core/fpdfapi/parser/cpdf_hint_tables.h"
 
 struct DummyLinearizedDictionary {
@@ skipping 64 matching lines @@
   const int32_t* data32 = reinterpret_cast<const int32_t*>(data);
   DummyLinearizedDictionary dummy_dict;
   dummy_dict.end_of_first_page_offset = GetData(&data32, &data, &size);
   dummy_dict.number_of_pages = GetData(&data32, &data, &size);
   dummy_dict.first_page_object_number = GetData(&data32, &data, &size);
   dummy_dict.first_page_number = GetData(&data32, &data, &size);
   dummy_dict.primary_hint_stream_offset = GetData(&data32, &data, &size);
   dummy_dict.primary_hint_stream_length = GetData(&data32, &data, &size);
   dummy_dict.shared_hint_table_offset = GetData(&data32, &data, &size);
 
-  CPDF_Dictionary* dummy_linearized_dict = new CPDF_Dictionary;
-
+  std::unique_ptr<CPDF_Dictionary> dummy_linearized_dict(new CPDF_Dictionary);
   {
-    HintTableForFuzzing hint_table(&dummy_dict, dummy_linearized_dict);
+    HintTableForFuzzing hint_table(&dummy_dict, dummy_linearized_dict.get());
     hint_table.Fuzz(data, size);
   }
-
-  dummy_linearized_dict->Release();
   return 0;
 }