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

ios/web/net/crw_cert_verification_controller.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/net/crw_cert_verification_controller.h"
 
 #include "base/ios/block_types.h"
 #include "base/logging.h"
 #include "base/mac/bind_objc_block.h"
 #include "base/mac/scoped_block.h"
@@ skipping 106 matching lines @@
 };
 
 typedef scoped_refptr<BlockHolder<web::PolicyDecisionHandler>>
     PolicyDecisionHandlerHolder;
 
 }  // namespace
 
 @interface CRWCertVerificationController () {
   // Cert verification object which wraps |net::CertVerifier|. Must be created,
   // used and destroyed on IO Thread.
-  scoped_ptr<web::CertVerifierBlockAdapter> _certVerifier;
+  std::unique_ptr<web::CertVerifierBlockAdapter> _certVerifier;
 
   // URLRequestContextGetter for obtaining net layer objects.
   net::URLRequestContextGetter* _contextGetter;
 
   // Used to remember user exceptions to invalid certs.
   scoped_refptr<web::CertificatePolicyCache> _certPolicyCache;
 }
 
 // Cert verification flags. Must be used on IO Thread.
 @property(nonatomic, readonly) int certVerifyFlags;
@@ skipping 345 matching lines @@
   web::CertPolicy::Judgment judgment = _certPolicyCache->QueryPolicy(
       leafCert.get(), base::SysNSStringToUTF8(host),
       certVerifierResult.cert_status);
 
   return (judgment == web::CertPolicy::ALLOWED)
              ? web::CERT_ACCEPT_POLICY_RECOVERABLE_ERROR_ACCEPTED_BY_USER
              : web::CERT_ACCEPT_POLICY_RECOVERABLE_ERROR_UNDECIDED_BY_USER;
 }
 
 @end