Oilpan: Fix Oilpan build for GCC after r171244.
Oilpan: Fix Oilpan build for GCC after r171244.

TBR=tkent@chromium.org
BUG=

Review URL: https://codereview.chromium.org/232763002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@171247 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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