[webcrypto] Support 256-bit AES-GCM for OpenSSL implementation.

content/child/webcrypto/shared_crypto_unittest.cc

Index: content/child/webcrypto/shared_crypto_unittest.cc
diff --git a/content/child/webcrypto/shared_crypto_unittest.cc b/content/child/webcrypto/shared_crypto_unittest.cc
index b6fa177db7da2a99daeb9d6f26f5eb18b07fc882..39323a24cf64c20c37b102ae1a6790fc661f0f81 100644
--- a/content/child/webcrypto/shared_crypto_unittest.cc
+++ b/content/child/webcrypto/shared_crypto_unittest.cc
@@ -3286,15 +3286,6 @@ TEST_F(SharedCryptoTest, AesGcmSampleSets) {
     const std::vector<uint8_t> test_cipher_text =
         GetBytesFromHexString(test, "cipher_text");
 
-#if defined(USE_OPENSSL)
-    // TODO(eroman): Add support for 256-bit keys.
-    if (test_key.size() == 32) {
-      LOG(WARNING)
-          << "OpenSSL doesn't support 256-bit keys for AES-GCM; skipping";
-      continue;
-    }
-#endif
-
     blink::WebCryptoKey key = ImportSecretKeyFromRaw(
         test_key,
         CreateAlgorithm(blink::WebCryptoAlgorithmIdAesGcm),