Ojan Vafai 2fa3e52b6d Make removing a transform not crash.
This broke with https://codereview.chromium.org/965013003.
Before that patch, updateTransform was only called on the
RenderLayer itself. Now it's called on the RenderBox,
so we need to null check the RenderLayer.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/969893002
2015-03-02 14:37:12 -08:00
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