https://bugs.webkit.org/show_bug.cgi?id=95070

        Roll out r126717, and another change that depends on it.
        r126717: Remove parent pointer from StyleSheetContents and StyleRuleImport
        r127123: Cache and share parsed imported stylesheets

        * css/CSSImportRule.cpp:
        * css/CSSImportRule.h:
        * css/CSSStyleSheet.cpp:
        (WebCore::CSSStyleSheet::willMutateRules):
        (WebCore::CSSStyleSheet::reattachChildRuleCSSOMWrappers):
        (WebCore::CSSStyleSheet::insertRule):
        (WebCore::CSSStyleSheet::ownerDocument):
        * css/CSSStyleSheet.h:
        (WebCore::CSSStyleSheet::clearOwnerRule):
        * css/StyleRuleImport.cpp:
        (WebCore::StyleRuleImport::StyleRuleImport):
        (WebCore::StyleRuleImport::~StyleRuleImport):
        (WebCore::StyleRuleImport::setCSSStyleSheet):
        (WebCore::StyleRuleImport::isLoading):
        (WebCore::StyleRuleImport::requestStyleSheet):
        * css/StyleRuleImport.h:
        (WebCore::StyleRuleImport::parentStyleSheet):
        (WebCore::StyleRuleImport::setParentStyleSheet):
        (WebCore::StyleRuleImport::clearParentStyleSheet):
        (ImportedStyleSheetClient):
        (WebCore::StyleRuleImport::ImportedStyleSheetClient::ImportedStyleSheetClient):
        (WebCore::StyleRuleImport::ImportedStyleSheetClient::~ImportedStyleSheetClient):
        (WebCore::StyleRuleImport::ImportedStyleSheetClient::setCSSStyleSheet):
        * css/StyleSheetContents.cpp:
        (WebCore::StyleSheetContents::StyleSheetContents):
        (WebCore::StyleSheetContents::isCacheable):
        (WebCore::StyleSheetContents::parserAppendRule):
        (WebCore::StyleSheetContents::clearRules):
        (WebCore::StyleSheetContents::wrapperInsertRule):
        (WebCore::StyleSheetContents::wrapperDeleteRule):
        (WebCore::StyleSheetContents::parseAuthorStyleSheet):
        (WebCore::StyleSheetContents::parseStringAtLine):
        (WebCore::StyleSheetContents::checkLoaded):
        (WebCore::StyleSheetContents::notifyLoadedSheet):
        (WebCore::StyleSheetContents::startLoadingDynamicSheet):
        (WebCore::StyleSheetContents::rootStyleSheet):
        (WebCore::StyleSheetContents::singleOwnerNode):
        (WebCore::StyleSheetContents::singleOwnerDocument):
        (WebCore::StyleSheetContents::parentStyleSheet):
        * css/StyleSheetContents.h:
        (WebCore::StyleSheetContents::create):
        (StyleSheetContents):
        (WebCore::StyleSheetContents::ownerRule):
        (WebCore::StyleSheetContents::clearOwnerRule):
        * dom/ProcessingInstruction.cpp:
        (WebCore::ProcessingInstruction::parseStyleSheet):
        * dom/StyleElement.cpp:
        (WebCore::StyleElement::createSheet):
        * html/HTMLLinkElement.cpp:
        (WebCore::HTMLLinkElement::setCSSStyleSheet):
        * loader/cache/CachedCSSStyleSheet.cpp:
        (WebCore::CachedCSSStyleSheet::saveParsedStyleSheet):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@128637 268f45cc-cd09-0410-ab3c-d52691b4dbfc