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

ios/chrome/browser/sync/fake_sync_service_factory.h

Index: ios/chrome/browser/sync/fake_sync_service_factory.h
diff --git a/ios/chrome/browser/sync/fake_sync_service_factory.h b/ios/chrome/browser/sync/fake_sync_service_factory.h
index 60741fb2189f0482f54d947650c561a158cdecc7..cc5de42ec81af43f9880561b2a19c79eb49f4d5a 100644
--- a/ios/chrome/browser/sync/fake_sync_service_factory.h
+++ b/ios/chrome/browser/sync/fake_sync_service_factory.h
@@ -5,8 +5,9 @@
 #ifndef IOS_CHROME_BROWSER_SYNC_FAKE_SYNC_SERVICE_FACTORY_H_
 #define IOS_CHROME_BROWSER_SYNC_FAKE_SYNC_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 {
@@ -42,7 +43,7 @@ class FakeSyncServiceFactory : public BrowserStateKeyedServiceFactory {
   ~FakeSyncServiceFactory() override;
 
   // BrowserStateKeyedServiceFactory implementation.
-  scoped_ptr<KeyedService> BuildServiceInstanceFor(
+  std::unique_ptr<KeyedService> BuildServiceInstanceFor(
       web::BrowserState* context) const override;
 
   DISALLOW_COPY_AND_ASSIGN(FakeSyncServiceFactory);