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

ios/chrome/browser/browsing_data/ios_chrome_browsing_data_remover.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.
 
 #ifndef IOS_CHROME_BROWSER_BROWSING_DATA_IOS_CHROME_BROWSING_DATA_REMOVER_H_
 #define IOS_CHROME_BROWSER_BROWSING_DATA_IOS_CHROME_BROWSING_DATA_REMOVER_H_
 
 #include <set>
 
 #include "base/gtest_prod_util.h"
@@ skipping 91 matching lines @@
   // been deleted, cache cleared and all other tasks scheduled.
   class Observer {
    public:
     virtual void OnIOSChromeBrowsingDataRemoverDone() = 0;
 
    protected:
     virtual ~Observer() {}
   };
 
   using Callback = base::Callback<void(const NotificationDetails&)>;
-  using CallbackSubscription = scoped_ptr<
+  using CallbackSubscription = std::unique_ptr<
       base::CallbackList<void(const NotificationDetails&)>::Subscription>;
 
   // Creates a IOSChromeBrowsingDataRemover bound to a specific period of time
   // (as defined via a TimePeriod). Returns a raw pointer, as
   // IOSChromeBrowsingDataRemover retains ownership of itself, and deletes
   // itself once finished.
   static IOSChromeBrowsingDataRemover* CreateForPeriod(
       ios::ChromeBrowserState* browser_state,
       TimePeriod period);
 
@@ skipping 133 matching lines @@
   bool waiting_for_clear_passwords_ = false;
 
   // The removal mask for the current removal operation.
   int remove_mask_ = 0;
 
   base::ObserverList<Observer> observer_list_;
 
   // Used if we need to clear history.
   base::CancelableTaskTracker history_task_tracker_;
 
-  scoped_ptr<TemplateURLService::Subscription> template_url_sub_;
+  std::unique_ptr<TemplateURLService::Subscription> template_url_sub_;
 
   DISALLOW_COPY_AND_ASSIGN(IOSChromeBrowsingDataRemover);
 };
 
 #endif  // IOS_CHROME_BROWSER_BROWSING_DATA_IOS_CHROME_BROWSING_DATA_REMOVER_H_