Ojan Vafai cec128f499 Remove some dead RenderLayer code.
-m_hasSelfPaintingLayerDescendant is never read.
-remove showLayerTree. The layer tree is going away. We won't need this.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/952343003
2015-02-25 15:48:59 -08:00
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