Temporarily CHECK use after free in Value

mojo/common/values_struct_traits.h

 // Copyright 2016 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.
 
 #ifndef MOJO_COMMON_VALUES_STRUCT_TRAITS_H_
 #define MOJO_COMMON_VALUES_STRUCT_TRAITS_H_
 
 #include "base/values.h"
 #include "mojo/common/values.mojom.h"
 #include "mojo/public/cpp/bindings/array_traits.h"
@@ skipping 117 matching lines @@
       case base::Value::Type::DOUBLE:
         return common::mojom::ValueDataView::Tag::DOUBLE_VALUE;
       case base::Value::Type::STRING:
         return common::mojom::ValueDataView::Tag::STRING_VALUE;
       case base::Value::Type::BINARY:
         return common::mojom::ValueDataView::Tag::BINARY_VALUE;
       case base::Value::Type::DICTIONARY:
         return common::mojom::ValueDataView::Tag::DICTIONARY_VALUE;
       case base::Value::Type::LIST:
         return common::mojom::ValueDataView::Tag::LIST_VALUE;
+      case base::Value::Type::DELETED:
+        // TODO(crbug.com/697817): This means a use-after-free.
+        CHECK(false);
+        return common::mojom::ValueDataView::Tag::NULL_VALUE;
     }
     NOTREACHED();
     return common::mojom::ValueDataView::Tag::NULL_VALUE;
   }
 
   static common::mojom::NullValuePtr null_value(const base::Value& value) {
     return common::mojom::NullValuePtr();
   }
 
   static bool bool_value(const base::Value& value) {
@@ skipping 100 matching lines @@
                        base::Value>::dictionary_value(*value);
   }
 
   static bool Read(common::mojom::ValueDataView data,
                    std::unique_ptr<base::Value>* value);
 };
 
 }  // namespace mojo
 
 #endif  // MOJO_COMMON_VALUES_STRUCT_TRAITS_H_