Refactor: Extract common code for generating asymmetric keys to a helper.

content/child/webcrypto/openssl/ec_key_openssl.cc

Index: content/child/webcrypto/openssl/ec_key_openssl.cc
diff --git a/content/child/webcrypto/openssl/ec_key_openssl.cc b/content/child/webcrypto/openssl/ec_key_openssl.cc
index 81e233701f42767301e104023301db12f4942f6f..a04be160c7c8d941fa2d06acf8c8955281b913cb 100644
--- a/content/child/webcrypto/openssl/ec_key_openssl.cc
+++ b/content/child/webcrypto/openssl/ec_key_openssl.cc
@@ -208,19 +208,15 @@ Status EcAlgorithm::GenerateKey(const blink::WebCryptoAlgorithm& algorithm,
                                 bool extractable,
                                 blink::WebCryptoKeyUsageMask combined_usages,
                                 GenerateKeyResult* result) const {
-  Status status = CheckKeyCreationUsages(
-      all_public_key_usages_ | all_private_key_usages_, combined_usages);
+  blink::WebCryptoKeyUsageMask public_usages = 0;
+  blink::WebCryptoKeyUsageMask private_usages = 0;
+
+  Status status = GetUsagesForGenerateAsymmetricKey(
+      all_public_key_usages_, all_private_key_usages_, combined_usages,
+      &public_usages, &private_usages);
   if (status.IsError())
     return status;
 
-  const blink::WebCryptoKeyUsageMask public_usages =
-      combined_usages & all_public_key_usages_;
-  const blink::WebCryptoKeyUsageMask private_usages =
-      combined_usages & all_private_key_usages_;
-
-  if (private_usages == 0)
-    return Status::ErrorCreateKeyEmptyUsages();
-
   const blink::WebCryptoEcKeyGenParams* params = algorithm.ecKeyGenParams();
 
   crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);