Move property setting/removing/addParsedProperty/addParsedProperties functions to MutableStylePrope…

Source/core/svg/SVGElement.cpp

Index: Source/core/svg/SVGElement.cpp
diff --git a/Source/core/svg/SVGElement.cpp b/Source/core/svg/SVGElement.cpp
index 4a566a8f6da34249dbfa341020ef1646c52a6b2f..8e0a451eeaa6be438c8ec58de2f2c53d9c5a7f67 100644
--- a/Source/core/svg/SVGElement.cpp
+++ b/Source/core/svg/SVGElement.cpp
@@ -597,14 +597,14 @@ PassRefPtr<RenderStyle> SVGElement::customStyleForRenderer()
     return document()->styleResolver()->styleForElement(correspondingElement(), style, DisallowStyleSharing);
 }
 
-StylePropertySet* SVGElement::animatedSMILStyleProperties() const
+MutableStylePropertySet* SVGElement::animatedSMILStyleProperties() const
 {
     if (hasSVGRareData())
         return svgRareData()->animatedSMILStyleProperties();
     return 0;
 }
 
-StylePropertySet* SVGElement::ensureAnimatedSMILStyleProperties()
+MutableStylePropertySet* SVGElement::ensureAnimatedSMILStyleProperties()
 {
     return ensureSVGRareData()->ensureAnimatedSMILStyleProperties();
 }