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

ios/chrome/browser/sync/ios_chrome_sync_client.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_SYNC_IOS_CHROME_SYNC_CLIENT_H__
 #define IOS_CHROME_BROWSER_SYNC_IOS_CHROME_SYNC_CLIENT_H__
 
 #include <vector>
 
 #include "base/macros.h"
@@ skipping 41 matching lines @@
   base::WeakPtr<syncer::SyncableService> GetSyncableServiceForType(
       syncer::ModelType type) override;
   syncer_v2::ModelTypeService* GetModelTypeServiceForType(
       syncer::ModelType type) override;
   scoped_refptr<syncer::ModelSafeWorker> CreateModelWorkerForGroup(
       syncer::ModelSafeGroup group,
       syncer::WorkerLoopDestructionObserver* observer) override;
   sync_driver::SyncApiComponentFactory* GetSyncApiComponentFactory() override;
 
   void SetSyncApiComponentFactoryForTesting(
-      scoped_ptr<sync_driver::SyncApiComponentFactory> component_factory);
+      std::unique_ptr<sync_driver::SyncApiComponentFactory> component_factory);
 
   // Iterates over browser states and returns any trackers that can be found.
   static void GetDeviceInfoTrackers(
       std::vector<const sync_driver::DeviceInfoTracker*>* trackers);
 
  private:
   ios::ChromeBrowserState* const browser_state_;
 
   // The sync api component factory in use by this client.
-  scoped_ptr<sync_driver::SyncApiComponentFactory> component_factory_;
+  std::unique_ptr<sync_driver::SyncApiComponentFactory> component_factory_;
 
   // Members that must be fetched on the UI thread but accessed on their
   // respective backend threads.
   scoped_refptr<autofill::AutofillWebDataService> web_data_service_;
   scoped_refptr<password_manager::PasswordStore> password_store_;
 
-  scoped_ptr<sync_sessions::SyncSessionsClient> sync_sessions_client_;
+  std::unique_ptr<sync_sessions::SyncSessionsClient> sync_sessions_client_;
 
   const scoped_refptr<syncer::ExtensionsActivity> dummy_extensions_activity_;
 
   base::WeakPtrFactory<IOSChromeSyncClient> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(IOSChromeSyncClient);
 };
 
 #endif  // IOS_CHROME_BROWSER_SYNC_IOS_CHROME_SYNC_CLIENT_H__