Remove some unnecessary refcount increments in WebCrypto's EC code.

components/webcrypto/algorithms/ecdsa.cc

Index: components/webcrypto/algorithms/ecdsa.cc
diff --git a/components/webcrypto/algorithms/ecdsa.cc b/components/webcrypto/algorithms/ecdsa.cc
index a77e77dd39c37d0014e5d8d8a08462207853fae0..0b829a8d2129e53285e955eb01df137ebe4654f5 100644
--- a/components/webcrypto/algorithms/ecdsa.cc
+++ b/components/webcrypto/algorithms/ecdsa.cc
@@ -46,11 +46,11 @@ Status GetPKeyAndDigest(const blink::WebCryptoAlgorithm& algorithm,
 Status GetEcGroupOrderSize(EVP_PKEY* pkey, size_t* order_size_bytes) {
   crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
 
-  crypto::ScopedEC_KEY ec(EVP_PKEY_get1_EC_KEY(pkey));
-  if (!ec.get())
+  EC_KEY* ec = EVP_PKEY_get0_EC_KEY(pkey);
+  if (!ec)
     return Status::ErrorUnexpected();
 
-  const EC_GROUP* group = EC_KEY_get0_group(ec.get());
+  const EC_GROUP* group = EC_KEY_get0_group(ec);
 
   crypto::ScopedBIGNUM order(BN_new());
   if (!EC_GROUP_get_order(group, order.get(), NULL))