Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/build/scripts/templates/StyleBuilderFunctions.cpp.tmpl

 {% from "macros.tmpl" import lower_first -%}
 
 {#
     This file is for property handlers which use the templating engine to
     reduce (handwritten) code duplication.
 
     The `properties' dict can be used to access a property's parameters in
     jinja2 templates (i.e. setter, getter, initial, type_name)
 -#}
 
@@ skipping 462 matching lines @@
 
 {{ apply_value_number("CSSPropertyInternalMarqueeRepetition", "CSSValueInfinite") }}
 
 {%- macro apply_value_shape(property_id) %}
 {{ declare_value_function(property_id) }}
 {
     {%- set property = properties[property_id] %}
     if (value->isPrimitiveValue()) {
         CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
         if (primitiveValue->getValueID() == CSSValueAuto)
-            {{ set_value(property) }}(0);
+            {{ set_value(property) }}(nullptr);
         else if (primitiveValue->getValueID() == CSSValueMarginBox
             || primitiveValue->getValueID() == CSSValueBorderBox
             || primitiveValue->getValueID() == CSSValuePaddingBox
             || primitiveValue->getValueID() == CSSValueContentBox)
             {{ set_value(property) }}(ShapeValue::createLayoutBoxValue(LayoutBox(*primitiveValue)));
         else if (primitiveValue->getValueID() == CSSValueOutsideShape)
             {{ set_value(property) }}(ShapeValue::createOutsideValue());
         else if (primitiveValue->isShape()) {
             {{ set_value(property) }}(ShapeValue::createShapeValue(basicShapeForValue(state, primitiveValue->getShapeValue())));
         }
     } else if (value->isImageValue() || value->isImageSetValue()) {
         {{ set_value(property) }}(ShapeValue::createImageValue(state.styleImage({{property_id}}, value)));
     }
 }
 {%- endmacro %}
 
 {{ apply_value_shape("CSSPropertyShapeInside") }}
 {{ apply_value_shape("CSSPropertyShapeOutside") }}
 
 } // namespace WebCore