Move most of the [Pass]RefPtr's of CSSPrimitiveValue to our transition types.

Source/core/css/CSSBorderImageSliceValue.h

Index: Source/core/css/CSSBorderImageSliceValue.h
diff --git a/Source/core/css/CSSBorderImageSliceValue.h b/Source/core/css/CSSBorderImageSliceValue.h
index 87c02276d79018e61ce34abd68fceffa755fd463..6243cf432dcee3bb0d68f0c9420dc906913dc381 100644
--- a/Source/core/css/CSSBorderImageSliceValue.h
+++ b/Source/core/css/CSSBorderImageSliceValue.h
@@ -36,7 +36,7 @@ class Rect;
 
 class CSSBorderImageSliceValue : public CSSValue {
 public:
-    static PassRefPtrWillBeRawPtr<CSSBorderImageSliceValue> create(PassRefPtr<CSSPrimitiveValue> slices, bool fill)
+    static PassRefPtrWillBeRawPtr<CSSBorderImageSliceValue> create(PassRefPtrWillBeRawPtr<CSSPrimitiveValue> slices, bool fill)
     {
         return adoptRefCountedWillBeRefCountedGarbageCollected(new CSSBorderImageSliceValue(slices, fill));
     }
@@ -51,11 +51,11 @@ public:
 
     // These four values are used to make "cuts" in the border image. They can be numbers
     // or percentages.
-    RefPtr<CSSPrimitiveValue> m_slices;
+    RefPtrWillBeMember<CSSPrimitiveValue> m_slices;
     bool m_fill;
 
 private:
-    CSSBorderImageSliceValue(PassRefPtr<CSSPrimitiveValue> slices, bool fill);
+    CSSBorderImageSliceValue(PassRefPtrWillBeRawPtr<CSSPrimitiveValue> slices, bool fill);
 };
 
 DEFINE_CSS_VALUE_TYPE_CASTS(CSSBorderImageSliceValue, isBorderImageSliceValue());