Temporarily CHECK use after free in Value

ppapi/shared_impl/private/ppb_x509_certificate_private_shared.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 "ppapi/shared_impl/private/ppb_x509_certificate_private_shared.h"
 
 #include <utility>
 
 #include "base/logging.h"
 #include "ppapi/shared_impl/ppapi_globals.h"
@@ skipping 57 matching lines @@
       const char* buffer = value->GetBuffer();
       PP_Var array_buffer =
           PpapiGlobals::Get()->GetVarTracker()->MakeArrayBufferPPVar(size,
                                                                      buffer);
       return array_buffer;
     }
     case base::Value::Type::DICTIONARY:
     case base::Value::Type::LIST:
       // Not handled.
       break;
+    case base::Value::Type::DELETED:
+      // TODO(crbug.com/697817): This means |value| is used after free.
+      CHECK(false);
+      break;
   }
 
   // Should not reach here.
   CHECK(false);
   return PP_MakeUndefined();
 }
 
 //------------------------------------------------------------------------------
 
 PPB_X509Certificate_Private_Shared::PPB_X509Certificate_Private_Shared(
@@ skipping 49 matching lines @@
     const std::vector<char>& der,
     PPB_X509Certificate_Fields* result) {
   // A concrete PPB_X509Certificate_Private_Shared should only ever be
   // constructed by passing in PPB_X509Certificate_Fields, in which case it is
   // already initialized.
   CHECK(false);
   return false;
 }
 
 }  // namespace ppapi