Temporarily CHECK use after free in Value

ipc/ipc_message_utils.cc

 // 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.
 
 #include "ipc/ipc_message_utils.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/files/file_path.h"
@@ skipping 184 matching lines @@
       break;
     }
     case base::Value::Type::LIST: {
       const base::ListValue* list = static_cast<const base::ListValue*>(value);
       WriteParam(m, static_cast<int>(list->GetSize()));
       for (const auto& entry : *list) {
         WriteValue(m, entry.get(), recursion + 1);
       }
       break;
     }
+    case base::Value::Type::DELETED: {
+      // TODO(crbug.com/697817): This means a use-after-free.
+      CHECK(false);
+      return;
+    }
   }
 }
 
 // Helper for ReadValue that reads a DictionaryValue into a pre-allocated
 // object.
 bool ReadDictionaryValue(const base::Pickle* m,
                          base::PickleIterator* iter,
                          base::DictionaryValue* value,
                          int recursion) {
   int size;
@@ skipping 1014 matching lines @@
   return result;
 }
 
 void ParamTraits<MSG>::Log(const param_type& p, std::string* l) {
   l->append("<MSG>");
 }
 
 #endif  // OS_WIN
 
 }  // namespace IPC