Fix silent truncations when extracting values from CheckedNumeric

components/webcrypto/algorithms/aes_cbc.cc

Index: components/webcrypto/algorithms/aes_cbc.cc
diff --git a/components/webcrypto/algorithms/aes_cbc.cc b/components/webcrypto/algorithms/aes_cbc.cc
index c9e941aa7ee92f636d0dc84e5e4e8c0853fb35aa..678aa5ac2cefa6a2f162c77f1a5b13144440c220 100644
--- a/components/webcrypto/algorithms/aes_cbc.cc
+++ b/components/webcrypto/algorithms/aes_cbc.cc
@@ -1,3 +1,4 @@
+
 // Copyright 2014 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.
@@ -55,7 +56,8 @@ Status AesCbcEncryptDecrypt(EncryptOrDecrypt cipher_operation,
   if (!output_max_len.IsValid())
     return Status::ErrorDataTooLarge();
 
-  const unsigned remainder = output_max_len.ValueOrDie() % AES_BLOCK_SIZE;
+  const unsigned remainder =
+      base::ValueOrDieForType<unsigned>(output_max_len % AES_BLOCK_SIZE);
   if (remainder != 0)
     output_max_len += AES_BLOCK_SIZE - remainder;
   if (!output_max_len.IsValid())
@@ -71,7 +73,7 @@ Status AesCbcEncryptDecrypt(EncryptOrDecrypt cipher_operation,
     return Status::OperationError();
   }
 
-  buffer->resize(output_max_len.ValueOrDie());
+  buffer->resize(base::ValueOrDieForType<size_t>(output_max_len));
 
   int output_len = 0;
   if (!EVP_CipherUpdate(context.get(), buffer->data(), &output_len,