Remove unused parameter to updateLayerPositionsAfterLayout

We don't use this parameter. There's no reason to pass it in.

R=esprehn@chromium.org

Review URL: https://codereview.chromium.org/441073002

git-svn-id: svn://svn.chromium.org/blink/trunk@179646 bbb929c8-8fbe-4397-9dbb-9b2b20218538