Remove uses of SkImageDecoder from gms

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1791583002

Committed: https://skia.googlesource.com/skia/+/d427266a58af7e6ea6c12c9cd56ade3e179a0c04

Review URL: https://codereview.chromium.org/1791583002
13 files changed