Only need to re-evaluate MQ on resize.
Only need to re-evaluate MQ on resize.

We did this on every layout, which should be unnecessary.

R=esprehn@chromium.org
BUG=450384
TEST=fast/media/media-query-list-listener
TEST=fast/css/media-query-dynamic.html

Review URL: https://codereview.chromium.org/888503003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@190034 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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