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

ios/chrome/browser/safe_browsing/safe_browsing_blocking_page.h

 // 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.
 //
 // Classes for managing the SafeBrowsing interstitial pages.
 //
 // When a user is about to visit a page the SafeBrowsing system has deemed to
 // be malicious, either as malware or a phishing page, we show an interstitial
 // page with some options (go back, continue) to give the user a chance to avoid
 // the harmful page.
@@ skipping 130 matching lines @@
   void PopulateMalwareLoadTimeData(base::DictionaryValue* load_time_data) const;
   void PopulateHarmfulLoadTimeData(base::DictionaryValue* load_time_data) const;
   void PopulatePhishingLoadTimeData(
       base::DictionaryValue* load_time_data) const;
 
   std::string GetMetricPrefix() const;
   std::string GetExtraMetricsSuffix() const;
   std::string GetRapporPrefix() const;
   std::string GetSamplingEventName() const;
 
-  scoped_ptr<IOSChromeControllerClient> controller_;
+  std::unique_ptr<IOSChromeControllerClient> controller_;
 
   DISALLOW_COPY_AND_ASSIGN(SafeBrowsingBlockingPage);
 };
 
 // Factory for creating SafeBrowsingBlockingPage.  Useful for tests.
 class SafeBrowsingBlockingPageFactory {
  public:
   virtual ~SafeBrowsingBlockingPageFactory() {}
 
   virtual SafeBrowsingBlockingPage* CreateSafeBrowsingPage(
       SafeBrowsingUIManager* ui_manager,
       web::WebState* web_state,
       const SafeBrowsingBlockingPage::UnsafeResourceList& unsafe_resources) = 0;
 };
 
 }  // namespace safe_browsing
 
 #endif  // IOS_CHROME_BROWSER_SAFE_BROWSING_SAFE_BROWSING_BLOCKING_PAGE_H_