Convert //sync from scoped_ptr to std::unique_ptr

sync/test/engine/mock_connection_manager.h

Index: sync/test/engine/mock_connection_manager.h
diff --git a/sync/test/engine/mock_connection_manager.h b/sync/test/engine/mock_connection_manager.h
index 03baff3ebb6567512e9d6bfa16b86f6a57c3395c..a47c4b30b17f4c3a435994f22552900147ab3262 100644
--- a/sync/test/engine/mock_connection_manager.h
+++ b/sync/test/engine/mock_connection_manager.h
@@ -394,8 +394,8 @@ class MockConnectionManager : public ServerConnectionManager {
   // True if we are only accepting GetUpdatesCallerInfo::PERIODIC requests.
   bool fail_non_periodic_get_updates_;
 
-  scoped_ptr<sync_pb::ClientCommand> gu_client_command_;
-  scoped_ptr<sync_pb::ClientCommand> commit_client_command_;
+  std::unique_ptr<sync_pb::ClientCommand> gu_client_command_;
+  std::unique_ptr<sync_pb::ClientCommand> commit_client_command_;
 
   // The next value to use for the position_in_parent property.
   int64_t next_position_in_parent_;