Temporarily CHECK use after free in Value

base/json/json_writer.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 "base/json/json_writer.h"
 
 #include <stdint.h>
 
 #include <cmath>
 #include <limits>
@@ skipping 180 matching lines @@
       }
 
       json_string_->push_back('}');
       return result;
     }
 
     case Value::Type::BINARY:
       // Successful only if we're allowed to omit it.
       DLOG_IF(ERROR, !omit_binary_values_) << "Cannot serialize binary value.";
       return omit_binary_values_;
+
+    case Value::Type::DELETED:
+      // TODO(crbug.com/697817): This means |node| is used after free.
+      CHECK(false);
+      return false;
   }
   NOTREACHED();
   return false;
 }
 
 void JSONWriter::IndentLine(size_t depth) {
   json_string_->append(depth * 3U, ' ');
 }
 
 }  // namespace base