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

ios/crnet/sdch_owner_pref_storage.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_CRNET_SDCH_OWNER_PREF_STORAGE_H_
 #define IOS_CRNET_SDCH_OWNER_PREF_STORAGE_H_
 
+#include <memory>
+
 #include "base/macros.h"
 #include "components/prefs/pref_store.h"
 #include "net/sdch/sdch_owner.h"
 
 class PersistentPrefStore;
 
 // Provides an implementation of SdchOwner::PrefStorage that maps to
 // Chrome's preferences system.
 class SdchOwnerPrefStorage
     : public net::SdchOwner::PrefStorage,
       public PrefStore::Observer {
  public:
   // The storage must outlive this class.
   explicit SdchOwnerPrefStorage(PersistentPrefStore* storage);
   ~SdchOwnerPrefStorage() override;
 
   ReadError GetReadError() const override;
   bool GetValue(const base::DictionaryValue** result) const override;
   bool GetMutableValue(base::DictionaryValue** result) override;
-  void SetValue(scoped_ptr<base::DictionaryValue> value) override;
+  void SetValue(std::unique_ptr<base::DictionaryValue> value) override;
   void ReportValueChanged() override;
   bool IsInitializationComplete() override;
   void StartObservingInit(net::SdchOwner* observer) override;
   void StopObservingInit() override;
 
  private:
   // PrefStore::Observer implementation.
   void OnPrefValueChanged(const std::string& key) override;
   void OnInitializationCompleted(bool succeeded) override;
 
   PersistentPrefStore* storage_;  // Non-owning.
   const std::string storage_key_;
 
   net::SdchOwner* init_observer_;  // Non-owning.
 
   DISALLOW_COPY_AND_ASSIGN(SdchOwnerPrefStorage);
 };
 
 #endif  // IOS_CRNET_SDCH_OWNER_PREF_STORAGE_H_