Oilpan: Fix the oilpan-enabled android build.

BUG=350973
R=haraken@chromium.org

Review URL: https://codereview.chromium.org/356613003

git-svn-id: svn://svn.chromium.org/blink/trunk@176915 bbb929c8-8fbe-4397-9dbb-9b2b20218538