[Refactoring] Remove elementParentStyle from SelectorCheckerContext
https://bugs.webkit.org/show_bug.cgi?id=107496

Reviewed by Darin Adler.

Since childrenAffectedBy bits were moved from RenderStyle to element,
now elementParentStyle is not used in SelectorChecker and
StyleResolver. We should remove the member varaiable from
SelectorCheckerContext.

No new tests, because just refactoring.

* css/SelectorChecker.cpp:
(WebCore::SelectorChecker::match):
* css/SelectorChecker.h:
(WebCore::SelectorChecker::SelectorCheckingContext::SelectorCheckingContext):
(SelectorCheckingContext):
* css/StyleResolver.cpp:
(WebCore::StyleResolver::ruleMatches):
Removed elementParentStyle.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@140531 268f45cc-cd09-0410-ab3c-d52691b4dbfc