Teach RuleSet about modern memory management

Teach RuleSet about modern memory management
https://bugs.webkit.org/show_bug.cgi?id=82856

Reviewed by Adam Barth.

No change in behavior, thus no tests.

* css/CSSStyleSelector.cpp:
(WebCore::RuleSet::create):
(RuleSet):
(WebCore::RuleSet::RuleSetSelectorPair::RuleSetSelectorPair):
(WebCore::CSSStyleSelector::CSSStyleSelector):
(WebCore::makeRuleSet):
(WebCore::CSSStyleSelector::appendAuthorStylesheets):
(WebCore::loadFullDefaultStyle):
(WebCore::loadSimpleDefaultStyle):
(WebCore::loadViewSourceStyle):
(WebCore::CSSStyleSelector::collectMatchingRulesForList):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@112840 268f45cc-cd09-0410-ab3c-d52691b4dbfc