Rename consumeClipPath to consumeWebkitClipPath in CSSPropertyParser

Reading consumeClipPath() mislead me into thinking clip-path
supported <basic-shape> values. This rename makes it clearer
that only the prefixed version supports those.

Review-Url: https://codereview.chromium.org/2181893002
Cr-Commit-Position: refs/heads/master@{#407716}
1 file changed