Remove unused import warning
Remove unused import warning

Since commit c36fa4d1a1086aa03e56aabae12669f8b1a1a1c4, std::ptr is not
used anymore.

Genymobile/gnirehtet,WPO-Foundation/gnirehtet,Genymobile/gnirehtet,WPO-Foundation/gnirehtet,Genymobile/gnirehtet,WPO-Foundation/gnirehtet,WPO-Foundation/gnirehtet