Oilpan: remove dated FIXME.
Oilpan: remove dated FIXME.

Layout object is no longer on the heap, so comment no longer applies.

R=haraken
BUG=398342
NOTRY=true

Review URL: https://codereview.chromium.org/941923003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@190623 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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