Please remove old Skia autoroll service account permissions

The project-chromium-robot-committers CRIA group contains a number of no-longer-used service accounts: https://chrome-infra-auth.appspot.com/auth/groups/project-chromium-robot-committers

Please remove the following:

afdo-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com
angle-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com
catapult-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com
chromite-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com
depot-tools-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com
fuchsia-sdk-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com
ios-internal-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com
nacl-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com
pdfium-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com
skia-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com
src-internal-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com
webrtc-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com
perfetto-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com
spirv-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com

That is, all service accounts in the group which belong to the "skia-buildbots" project.

Thanks!