Oilpan: Build fix after r175007

r175007 broke oilpan builds.

TBR=tkent

Review URL: https://codereview.chromium.org/301073002

git-svn-id: svn://svn.chromium.org/blink/trunk@175022 bbb929c8-8fbe-4397-9dbb-9b2b20218538