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

ios/chrome/browser/rlz/rlz_tracker_delegate_impl.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_RLZ_RLZ_TRACKER_DELEGATE_IMPL_H_
 #define IOS_CHROME_BROWSER_RLZ_RLZ_TRACKER_DELEGATE_IMPL_H_
 
+#include <memory>
+
 #include "base/callback.h"
 #include "base/callback_list.h"
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "components/rlz/rlz_tracker_delegate.h"
 
 struct OmniboxLog;
 
 namespace ios {
 class ChromeBrowserState;
 }
 
 // RLZTrackerDelegateImpl implements RLZTrackerDelegate abstract interface
 // and provides access to Chrome on iOS features.
@@ skipping 19 matching lines @@
   bool GetLanguage(base::string16* language) override;
   bool GetReferral(base::string16* referral) override;
   bool ClearReferral() override;
   void SetOmniboxSearchCallback(const base::Closure& callback) override;
   void SetHomepageSearchCallback(const base::Closure& callback) override;
 
   // Called when user open an URL from the Omnibox.
   void OnURLOpenedFromOmnibox(OmniboxLog* log);
 
   base::Closure on_omnibox_search_callback_;
-  scoped_ptr<base::CallbackList<void(OmniboxLog*)>::Subscription>
+  std::unique_ptr<base::CallbackList<void(OmniboxLog*)>::Subscription>
       on_omnibox_url_opened_subscription_;
 
   DISALLOW_COPY_AND_ASSIGN(RLZTrackerDelegateImpl);
 };
 
 #endif  // IOS_CHROME_BROWSER_RLZ_RLZ_TRACKER_DELEGATE_IMPL_H_