Mark MediaQueryData as stack allocated.
Mark MediaQueryData as stack allocated.

Its only use is as a part object of the stack-allocated MediaQueryParser.

R=ager@chromium.org
BUG=
NOTRY=true

Review URL: https://codereview.chromium.org/207743002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@169725 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