Update comment in aligned_memory.h to refer to unique_ptr This is partially from upstream 093de9b30c0ba and partially from https://codereview.chromium.org/1939833002/. Change-Id: I480d9c21ead9375c407ae64bdf78c94779ecb072 Reviewed-on: https://chromium-review.googlesource.com/341661 Reviewed-by: Scott Graham <scottmg@chromium.org>