Temporarily CHECK use after free in Value

base/values.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file specifies a recursive data storage class called Value intended for
 // storing settings and other persistable data.
 //
 // A Value represents something that can be stored in JSON or passed to/from
 // JavaScript. As such, it is NOT a generalized variant type, since only the
 // types supported by JavaScript/JSON are supported.
@@ skipping 155 matching lines @@
 
   // Compares if two Value objects have equal contents. Can handle NULLs.
   // NULLs are considered equal but different from Value::CreateNullValue().
   static bool Equals(const Value* a, const Value* b);
 
  protected:
   // TODO(crbug.com/646113): Make these private once DictionaryValue and
   // ListValue are properly inlined.
   Type type_;
 
+  // TODO(crbug.com/697817): Remove after diagnosing the bug.
+  bool alive_ = true;
+
   union {
     bool bool_value_;
     int int_value_;
     double double_value_;
     ManualConstructor<std::string> string_value_;
     ManualConstructor<std::vector<char>> binary_value_;
     // For current gcc and clang sizeof(DictStorage) = 48, which would result
     // in sizeof(Value) = 56 if DictStorage was stack allocated. Allocating it
     // on the heap results in sizeof(Value) = 40 for all of gcc, clang and MSVC.
     ManualConstructor<std::unique_ptr<DictStorage>> dict_ptr_;
@@ skipping 328 matching lines @@
   return out << static_cast<const Value&>(value);
 }
 
 // Stream operator so that enum class Types can be used in log statements.
 BASE_EXPORT std::ostream& operator<<(std::ostream& out,
                                      const Value::Type& type);
 
 }  // namespace base
 
 #endif  // BASE_VALUES_H_