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Ash stopped handling these fields in M87. Going forward, all Lacros
releases will target M87 beta or later (M87 beta + M88 dev/canary).
Therefore Lacros can stop sending these fields.

Clean up SkBitmapFromBitmap utility function, since it is no longer
used. We can't clean up BitmapFromSkBitmap yet, since it's still used
by ScreenManager.

Bug: 1123969
Test: lacros unit_tests
Test: trigger notifications using Notifications Galore test app
Change-Id: I631d1d955cdbe6c34cfecf00d701eec57c9455dc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2466491Reviewed-by: Jun Mukai <mukai@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816392}