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

components/webcrypto/algorithms/ecdsa.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <openssl/ec.h>
 #include <openssl/ec_key.h>
 #include <openssl/ecdsa.h>
 #include <openssl/evp.h>
 #include <stddef.h>
 #include <stdint.h>
@@ skipping 28 matching lines @@
   *digest = GetDigest(algorithm.ecdsaParams()->hash());
   if (!*digest)
     return Status::ErrorUnsupported();
   return Status::Success();
 }
 
 // Gets the EC key's order size in bytes.
 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))
     return Status::OperationError();
 
   *order_size_bytes = BN_num_bytes(order.get());
   return Status::Success();
 }
 
 // Formats a DER-encoded signature (ECDSA-Sig-Value as specified in RFC 3279) to
@@ skipping 187 matching lines @@
   }
 };
 
 }  // namespace
 
 std::unique_ptr<AlgorithmImplementation> CreateEcdsaImplementation() {
   return base::WrapUnique(new EcdsaImplementation);
 }
 
 }  // namespace webcrypto