If that's their plan, I predict another situation exactly like this one where Google decides that removing support is the best move forward. Careful, BMP, Chrome is out to get you!
This actually seems to use the encoder/decoder from the Rust image crate (1), which would bring the opportunity for more memory safe formats once BMP would be accepted.
I think Google are aiming to replace all of Chromiums decoders with memory-safe ones anyway, even for relatively simple formats.