Oilpan: fix build after r196924.

Return type mismatch uncovered by that CL, not the cause.

TBR=oilpan-reviews
BUG=
NOTRY=true

Review URL: https://codereview.chromium.org/1176993006

git-svn-id: svn://svn.chromium.org/blink/trunk@196931 bbb929c8-8fbe-4397-9dbb-9b2b20218538
1 file changed
tree: 9a0560df6e96bed7accdf140bd9f96a520a51871
  1. third_party/