Move create() methods from StylePropertySet to MutableStylePropertySet.
<http://webkit.org/b/114574>

Reviewed by Antti Koivisto.

Move the two create() methods that create MutableStylePropertySets from StylePropertySet
to MutableStylePropertySet, and make them actually return MutableStylePropertySets.
Switch to using {Pass,}RefPtr<MutableStylePropertySet> where appropriate to keep things building.

* css/CSSComputedStyleDeclaration.cpp:
(WebCore::CSSComputedStyleDeclaration::copyPropertiesInSet):
* css/CSSParser.cpp:
(WebCore::CSSParser::parseFontFaceValue):
* css/DOMWindowCSS.cpp:
(WebCore::DOMWindowCSS::supports):
* css/ElementRuleCollector.cpp:
(WebCore::leftToRightDeclaration):
(WebCore::rightToLeftDeclaration):
* css/FontLoader.cpp:
(WebCore::FontLoader::resolveFontStyle):
* css/StylePropertySet.cpp:
(WebCore::StylePropertySet::copyPropertiesInSet):
(WebCore::MutableStylePropertySet::create):
* css/StylePropertySet.h:
(StylePropertySet):
(MutableStylePropertySet):
* css/StyleResolver.cpp:
(WebCore::StyleResolver::resolveVariables):
* css/WebKitCSSMatrix.cpp:
(WebCore::WebKitCSSMatrix::setMatrixValue):
* dom/Attr.cpp:
(WebCore::Attr::style):
* dom/Document.cpp:
(WebCore::Document::createCSSStyleDeclaration):
* dom/StyledElement.cpp:
(WebCore::StyledElement::ensureMutableInlineStyle):
(WebCore::StyledElement::rebuildPresentationAttributeStyle):
* editing/ApplyStyleCommand.cpp:
(WebCore::copyStyleOrCreateEmpty):
* editing/EditingStyle.cpp:
(WebCore::editingStyleFromComputedStyle):
(WebCore::HTMLAttributeEquivalent::attributeValueAsCSSValue):
(WebCore::EditingStyle::setProperty):
(WebCore::EditingStyle::extractAndRemoveTextDirection):
(WebCore::styleFromMatchedRulesForElement):
(WebCore::EditingStyle::mergeStyleFromRulesForSerialization):
(WebCore::EditingStyle::forceInline):
* editing/Editor.cpp:
(WebCore::Editor::setBaseWritingDirection):
* editing/EditorCommand.cpp:
(WebCore::executeApplyStyle):
(WebCore::executeToggleStyleInList):
(WebCore::executeApplyParagraphStyle):
(WebCore::executeMakeTextWritingDirectionLeftToRight):
(WebCore::executeMakeTextWritingDirectionNatural):
(WebCore::executeMakeTextWritingDirectionRightToLeft):
* html/HTMLTableElement.cpp:
(WebCore::leakBorderStyle):
(WebCore::HTMLTableElement::createSharedCellStyle):
(WebCore::leakGroupBorderStyle):
* html/canvas/CanvasRenderingContext2D.cpp:
(WebCore::CanvasRenderingContext2D::setFont):
* inspector/InspectorStyleSheet.cpp:
(WebCore::InspectorStyle::setPropertyText):
(WebCore::InspectorStyleSheetForInlineStyle::getStyleAttributeRanges):
* page/DragController.cpp:
(WebCore::DragController::concludeEditDrag):
* svg/SVGElementRareData.h:
(WebCore::SVGElementRareData::ensureAnimatedSMILStyleProperties):
* svg/SVGFontFaceElement.cpp:
(WebCore::SVGFontFaceElement::SVGFontFaceElement):
* svg/SVGStyledElement.cpp:
(WebCore::SVGStyledElement::getPresentationAttribute):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@148395 268f45cc-cd09-0410-ab3c-d52691b4dbfc