This reverts commit30ba74cc26. Revert "Bug 2045119 - Add test cases for tampering with a shared memory handle's size. r=afranchuk" This reverts commit3cf9d15118. Revert "Bug 2045119 - Check sizes of received shared memory objects on `mmap`-using platforms. r=afranchuk" This reverts commit1d593b02d6.