Oilpan: fix build after r183735.
Oilpan: fix build after r183735.

TBR=haraken,oilpan-reviews
BUG=421948
NOTRY=true

Review URL: https://codereview.chromium.org/655213002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@183741 bbb929c8-8fbe-4397-9dbb-9b2b20218538

primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs