[webcrypto] Remove RSA-ES support (2 of 3)

content/child/webcrypto/webcrypto_util.cc

Index: content/child/webcrypto/webcrypto_util.cc
diff --git a/content/child/webcrypto/webcrypto_util.cc b/content/child/webcrypto/webcrypto_util.cc
index c6bf4b20a826ca1894cbcb3d3220fb3cead1a29d..871fc3c7b9b6485b95e7c82af380c50582338591 100644
--- a/content/child/webcrypto/webcrypto_util.cc
+++ b/content/child/webcrypto/webcrypto_util.cc
@@ -179,6 +179,11 @@ bool CreateSecretKeyAlgorithm(const blink::WebCryptoAlgorithm& algorithm,
   }
 }
 
+bool IsAlgorithmRsa(blink::WebCryptoAlgorithmId alg_id) {
+  return alg_id == blink::WebCryptoAlgorithmIdRsaOaep ||
+         alg_id == blink::WebCryptoAlgorithmIdRsaSsaPkcs1v1_5;
+}
+
 }  // namespace webcrypto
 
 }  // namespace content