Reviewed by Sam.

        - https://bugs.webkit.org/show_bug.cgi?id=19545
          use PassRefPtr, not RefPtr, for return values

        * css/CSSParser.cpp:
        (WebCore::CSSParser::parseGradient): Call release() when assigning result to avoid
        a little bit of refcount churn.

        * css/CSSStyleSelector.cpp:
        (WebCore::CSSStyleSelector::styleRulesForElement): Changed return value to PassRefPtr.
        (WebCore::CSSStyleSelector::pseudoStyleRulesForElement): Ditto.
        * css/CSSStyleSelector.h: Ditto.

        * svg/SVGElementInstanceList.cpp:
        (WebCore::SVGElementInstanceList::length): Tweaked formatting.
        (WebCore::SVGElementInstanceList::item): Changed return value to raw pointer.
        * svg/SVGElementInstanceList.h: Ditto.

        * xml/XSLTProcessor.cpp:
        (WebCore::XSLTProcessor::createDocumentFromSource): Changed return value to PassRefPtr.
        (WebCore::XSLTProcessor::transformToDocument): Ditto.
        (WebCore::XSLTProcessor::transformToFragment): Ditto.
        * xml/XSLTProcessor.h: Ditto.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@34551 268f45cc-cd09-0410-ab3c-d52691b4dbfc