They aren't used since commits a6585361, 3752f3a5, 88a7a29d, eef8ad1b, f67f058b, 04910fea and 9181610d. The method `image_bytes_to_megabytes` was never used and is a duplicate of the method `bytes_to_megabytes`.
a6585361
3752f3a5
88a7a29d
eef8ad1b
f67f058b
04910fea
9181610d