Only match :window-inactive on certain pseudo elements
Only match :window-inactive on certain pseudo elements

:window-inactive CSS pseudo class is only supported on ::selection
and various scrollbar pseudo elements, not any elements in general,
and it is not yet standardized either.

The original implementation dates back to WebKit around 2009:
http://trac.webkit.org/changeset/41094

If :window-inactive is specified on anything other than ::selection
or scrollbar pseudo elements, it causes an assertion in
SelectorChecker::checkPseudoClass()
(the case is not covered in switch-case).

BUG=478275

Review URL: https://codereview.chromium.org/1054583004

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@194025 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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