PseudoElement::setNeedsStyleRecalc() should compute a new style
PseudoElement::setNeedsStyleRecalc() should compute a new style

We need to clear the cached pseudo style whenever a PseudoElement specifically
requests a new style otherwise PseudoElement::customStyleForRenderer() will just
get the cached (old) style off the parent.

BUG=314968

Review URL: https://codereview.chromium.org/59013002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@161314 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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