Oilpan: fix build after r368814.

TBR=oilpan-reviews
BUG=540528
NOTRY=true
NOTREECHECKS=true
NOPRESUBMIT=true

Review URL: https://codereview.chromium.org/1575323002

Cr-Commit-Position: refs/heads/master@{#368817}
2 files changed