Oilpan: fix build after r183596.

Source/core/css/resolver/StyleBuilderConverter.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
  * copyright notice, this list of conditions and the following disclaimer
  * in the documentation and/or other materials provided with the
  * distribution.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 571 matching lines @@
 
 float StyleBuilderConverter::convertPerspective(StyleResolverState& state, CSSValue* value)
 {
     CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
 
     if (primitiveValue->getValueID() == CSSValueNone)
         return RenderStyle::initialPerspective();
 
     // CSSPropertyWebkitPerspective accepts unitless numbers.
     if (primitiveValue->isNumber()) {
-        RefPtr<CSSPrimitiveValue> px = CSSPrimitiveValue::create(primitiveValue->getDoubleValue(), CSSPrimitiveValue::CSS_PX);
+        RefPtrWillBeRawPtr<CSSPrimitiveValue> px = CSSPrimitiveValue::create(primitiveValue->getDoubleValue(), CSSPrimitiveValue::CSS_PX);
         return convertPerspectiveLength(state, px.get());
     }
 
     return convertPerspectiveLength(state, primitiveValue);
 }
 
 template <CSSValueID cssValueFor0, CSSValueID cssValueFor100>
 static Length convertOriginLength(StyleResolverState& state, CSSPrimitiveValue* primitiveValue)
 {
     if (primitiveValue->isValueID()) {
@@ skipping 171 matching lines @@
 {
     CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
     if (primitiveValue->getValueID()) {
         float multiplier = convertLineWidth<float>(state, value);
         return CSSPrimitiveValue::create(multiplier / 48, CSSPrimitiveValue::CSS_EMS)->computeLength<float>(state.cssToLengthConversionData());
     }
     return primitiveValue->computeLength<float>(state.cssToLengthConversionData());
 }
 
 } // namespace blink