Use a smart pointer for SkColorSpace factories

This should fix master-skia in Android because we no longer need
to include src/core for SkCodec.h.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1766413002

Review URL: https://codereview.chromium.org/1766413002
13 files changed