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

ios/chrome/browser/interstitials/ios_security_interstitial_page.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.
 
 #include "ios/chrome/browser/interstitials/ios_security_interstitial_page.h"
 
 #include "base/logging.h"
 #include "components/grit/components_resources.h"
 #include "components/prefs/pref_service.h"
 #include "components/security_interstitials/core/common_string_util.h"
@@ skipping 17 matching lines @@
   // Creating web_interstitial_ without showing it leaks memory, so don't
   // create it here.
 }
 
 IOSSecurityInterstitialPage::~IOSSecurityInterstitialPage() {}
 
 void IOSSecurityInterstitialPage::Show() {
   DCHECK(!web_interstitial_);
   web_interstitial_ = web::WebInterstitial::CreateHtmlInterstitial(
       web_state_, ShouldCreateNewNavigation(), request_url_,
-      scoped_ptr<web::HtmlWebInterstitialDelegate>(this));
+      std::unique_ptr<web::HtmlWebInterstitialDelegate>(this));
   web_interstitial_->Show();
   AfterShow();
 }
 
 std::string IOSSecurityInterstitialPage::GetHtmlContents() const {
   base::DictionaryValue load_time_data;
   PopulateInterstitialStrings(&load_time_data);
   webui::SetLoadTimeDataDefaults(
       GetApplicationContext()->GetApplicationLocale(), &load_time_data);
   std::string html = ResourceBundle::GetSharedInstance()
                          .GetRawDataResource(IDR_SECURITY_INTERSTITIAL_HTML)
                          .as_string();
   webui::AppendWebUiCssTextDefaults(&html);
   return webui::GetI18nTemplateHtml(html, &load_time_data);
 }
 
 base::string16 IOSSecurityInterstitialPage::GetFormattedHostName() const {
   return security_interstitials::common_string_util::GetFormattedHostName(
       request_url_);
 }
 
 bool IOSSecurityInterstitialPage::IsPrefEnabled(const char* pref_name) const {
   ios::ChromeBrowserState* browser_state =
       ios::ChromeBrowserState::FromBrowserState(web_state_->GetBrowserState());
   return browser_state->GetPrefs()->GetBoolean(pref_name);
 }