tree eaf3aad737e15b6aa1787d5a617862408ebfbf1a
parent 24fb1782d112dca7e4eddd3de6e7eb39cc0be2f2
author Yifan Hong <elsk@google.com> 1619464773 -0700
committer Yifan Hong <elsk@google.com> 1619464788 -0700

unique_fd: easier to forward declare

After this change, it is possible to do

namespace android::base {
  class unique_fd;
}

Test: pass
Bug: 186266747
Change-Id: I11a77e09b633860723b5c0ae4af260ce8d4e3de2