Check that usage isn't empty when generateKey() is called

content/child/webcrypto/openssl/sym_key_openssl.cc

Index: content/child/webcrypto/openssl/sym_key_openssl.cc
diff --git a/content/child/webcrypto/openssl/sym_key_openssl.cc b/content/child/webcrypto/openssl/sym_key_openssl.cc
index 39238335a26677fa9e3cb96d1872f80508131d62..01793b69742c7e8922d963dc794c0480d4e9615f 100644
--- a/content/child/webcrypto/openssl/sym_key_openssl.cc
+++ b/content/child/webcrypto/openssl/sym_key_openssl.cc
@@ -25,6 +25,9 @@ Status GenerateSecretKeyOpenSsl(const blink::WebCryptoKeyAlgorithm& algorithm,
                                 GenerateKeyResult* result) {
   crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
 
+  if (usages == 0)
+    return Status::ErrorCreateKeyEmptyUsages();
+
   std::vector<unsigned char> random_bytes(keylen_bytes, 0);
 
   if (keylen_bytes > 0) {