remove guarded old malloc code

Bug: skia:
Change-Id: I045e3816f04accebffd86c4aaaa5da67f198186c
Reviewed-on: https://skia-review.googlesource.com/91405
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Mike Reed <reed@google.com>
3 files changed