Convert //ios from scoped_ptr to std::unique_ptr.

ios/web/web_state/wk_web_view_security_util_unittest.mm

 // Copyright 2015 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.
 
 #import "ios/web/web_state/wk_web_view_security_util.h"
 
 #import <Foundation/Foundation.h>
 #include <Security/Security.h>
 
+#include <memory>
+
 #include "base/mac/scoped_cftyperef.h"
-#include "base/memory/scoped_ptr.h"
 #include "crypto/rsa_private_key.h"
 #include "net/cert/x509_cert_types.h"
 #include "net/cert/x509_certificate.h"
 #include "net/cert/x509_util.h"
 #include "net/ssl/ssl_info.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/gtest_mac.h"
 #include "testing/platform_test.h"
 
 namespace web {
 namespace {
 // Subject for testing self-signed certificate.
 const char kTestSubject[] = "self-signed";
 // Hostname for testing SecTrustRef objects.
 NSString* const kTestHost = @"www.example.com";
 
 // Returns an autoreleased certificate chain for testing. Chain will contain a
 // single self-signed cert with |subject| as a subject.
 NSArray* MakeTestCertChain(const std::string& subject) {
-  scoped_ptr<crypto::RSAPrivateKey> private_key;
+  std::unique_ptr<crypto::RSAPrivateKey> private_key;
   std::string der_cert;
   net::x509_util::CreateKeyAndSelfSignedCert(
       "CN=" + subject, 1, base::Time::Now(),
       base::Time::Now() + base::TimeDelta::FromDays(1), &private_key,
       &der_cert);
 
   base::ScopedCFTypeRef<SecCertificateRef> cert(
       net::X509Certificate::CreateOSCertHandleFromBytes(der_cert.data(),
                                                         der_cert.size()));
   NSArray* result = @[ reinterpret_cast<id>(cert.get()) ];
@@ skipping 233 matching lines @@
             GetSecurityStyleFromTrustResult(kSecTrustResultUnspecified));
 }
 
 // Tests GetSecurityStyleFromTrustResult with invalid SecTrustResultType result.
 TEST_F(WKWebViewSecurityUtilTest, GetSecurityStyleFromInvalidResult) {
   EXPECT_EQ(SECURITY_STYLE_UNKNOWN,
             GetSecurityStyleFromTrustResult(kSecTrustResultInvalid));
 }
 
 }  // namespace web