Fix oilpan build of MediaQuerySetTest.

TBR=haraken@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/180533008

git-svn-id: svn://svn.chromium.org/blink/trunk@168614 bbb929c8-8fbe-4397-9dbb-9b2b20218538