Oilpan: move SVG property hierarchy to the heap.

Source/core/css/SVGCSSComputedStyleDeclaration.cpp

Index: Source/core/css/SVGCSSComputedStyleDeclaration.cpp
diff --git a/Source/core/css/SVGCSSComputedStyleDeclaration.cpp b/Source/core/css/SVGCSSComputedStyleDeclaration.cpp
index e16e497e5c288504f3c1a580b9275bacd5d2cda1..c0eabe684849db7b8c93483551122c714a761593 100644
--- a/Source/core/css/SVGCSSComputedStyleDeclaration.cpp
+++ b/Source/core/css/SVGCSSComputedStyleDeclaration.cpp
@@ -45,9 +45,9 @@ static PassRefPtrWillBeRawPtr<CSSPrimitiveValue> glyphOrientationToCSSPrimitiveV
     }
 }
 
-static PassRefPtrWillBeRawPtr<CSSValue> strokeDashArrayToCSSValueList(PassRefPtr<SVGLengthList> passDashes)
+static PassRefPtrWillBeRawPtr<CSSValue> strokeDashArrayToCSSValueList(PassRefPtrWillBeRawPtr<SVGLengthList> passDashes)
 {
-    RefPtr<SVGLengthList> dashes = passDashes;
+    RefPtrWillBeRawPtr<SVGLengthList> dashes = passDashes;
 
     if (dashes->isEmpty())
         return CSSPrimitiveValue::createIdentifier(CSSValueNone);