don't include SkMalloc.h from SkTypes.h

Needed chrome CLs
https://chromium-review.googlesource.com/c/chromium/src/+/850741
https://chromium-review.googlesource.com/c/chromium/src/+/850920

Bug: skia:
Change-Id: Ic568174a56590a65bfa284c59fd104275ee78da9
Reviewed-on: https://skia-review.googlesource.com/90823
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Mike Reed <reed@google.com>
5 files changed