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

ios/chrome/browser/sync/sync_setup_service_factory.h

Index: ios/chrome/browser/sync/sync_setup_service_factory.h
diff --git a/ios/chrome/browser/sync/sync_setup_service_factory.h b/ios/chrome/browser/sync/sync_setup_service_factory.h
index e08709590cadd1b06f1d7582f6d406ae712cda4f..6ad3c22fed6f77593f3e28057471f5f0ccf23262 100644
--- a/ios/chrome/browser/sync/sync_setup_service_factory.h
+++ b/ios/chrome/browser/sync/sync_setup_service_factory.h
@@ -5,8 +5,9 @@
 #ifndef IOS_CHROME_BROWSER_SYNC_SYNC_SETUP_SERVICE_FACTORY_H_
 #define IOS_CHROME_BROWSER_SYNC_SYNC_SETUP_SERVICE_FACTORY_H_
 
+#include <memory>
+
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "components/keyed_service/ios/browser_state_keyed_service_factory.h"
 
 namespace base {
@@ -38,7 +39,7 @@ class SyncSetupServiceFactory : public BrowserStateKeyedServiceFactory {
   ~SyncSetupServiceFactory() override;
 
   // BrowserStateKeyedServiceFactory implementation.
-  scoped_ptr<KeyedService> BuildServiceInstanceFor(
+  std::unique_ptr<KeyedService> BuildServiceInstanceFor(
       web::BrowserState* context) const override;
 
   DISALLOW_COPY_AND_ASSIGN(SyncSetupServiceFactory);