Mark stylesheet as having media queries at consume time.

Marking the stylesheet as having media queries for @media at insertion
time meant we didn't mark the stylesheet when @media was a child rule
of another @-rule like @supports. Instead do the marking from the
consume method like we already did for @font-face rules.

Removed unnecessary marking from insertion methods and an unnecessary
boolean parameter which was always true.

R=timloh@chromium.org
BUG=621502

Review-Url: https://codereview.chromium.org/2081893003
Cr-Commit-Position: refs/heads/master@{#402766}
5 files changed