Oilpan: fix GC_PROFILE_MARKING compilation.
Oilpan: fix GC_PROFILE_MARKING compilation.

Fix build after r186355.

R=haraken
BUG=420515
NOTRY=true

Review URL: https://codereview.chromium.org/777173003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@186498 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