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Apparently it's fatal for GN to try to remove something that doesn't exist,
but not for GYP... the GYP list is way out of date.

SkTaskGroup{.cpp,.h} are not currently listed in utils.gypi,
so there's no need to remove them.

https://skia.googlesource.com/skia/+log/0c88d8233ba3a8baa9b4dd6ef515def6b3749980..a17aac8bd4c755c3a24befc7fd297969c0bb0861

CQ_EXTRA_TRYBOTS=tryserver.blink:linux_blink_rel,linux_blink_dbg

Bots seem to be failing before and after this CL.
NOTRY=true

BUG=

Review URL: https://codereview.chromium.org/537363002

Cr-Commit-Position: refs/heads/master@{#293318}