[webcrypto] Check for empty key usages *after* key creation rather than before, to match the spec's…

components/webcrypto/algorithms/secret_key_util.cc

Index: components/webcrypto/algorithms/secret_key_util.cc
diff --git a/components/webcrypto/algorithms/secret_key_util.cc b/components/webcrypto/algorithms/secret_key_util.cc
index 3110e26dc21ef94f6b0f9b9a2af25264ccaabc29..9f0b0bf993a257f82289267e477bbec01b66b689 100644
--- a/components/webcrypto/algorithms/secret_key_util.cc
+++ b/components/webcrypto/algorithms/secret_key_util.cc
@@ -50,13 +50,6 @@ Status CreateWebCryptoSecretKey(const CryptoData& key_data,
   return Status::Success();
 }
 
-Status CheckSecretKeyCreationUsages(
-    blink::WebCryptoKeyUsageMask all_possible_usages,
-    blink::WebCryptoKeyUsageMask actual_usages) {
-  return CheckKeyCreationUsages(all_possible_usages, actual_usages,
-                                EmptyUsagePolicy::REJECT_EMPTY);
-}
-
 void WriteSecretKeyJwk(const CryptoData& raw_key_data,
                        const std::string& algorithm,
                        bool extractable,