DM/PDF: stop adding unused rasterizer keywords

We can always add it back if we need it in the future.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1852713002

Review URL: https://codereview.chromium.org/1852713002
7 files changed