Elliott Sprehn fc6b820dd7 Add clear() to Element.classList.
We should support a fast way to remove all classes through the
classList instead of having to call removeAttribute() directly.

BUG=440529
R=ojan@chromium.org, rafaelw@chromium.org

Review URL: https://codereview.chromium.org/788093003
2014-12-09 17:56:41 -08:00
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