Clean up static_cast<const toBasicFoo*> by using toBasicFoo()

Source/core/rendering/shapes/Shape.cpp

Index: Source/core/rendering/shapes/Shape.cpp
diff --git a/Source/core/rendering/shapes/Shape.cpp b/Source/core/rendering/shapes/Shape.cpp
index 1a0fae619740533b20ef2f9ccd28dd48870d05eb..7054a6ed851f66c0cec94ed2ad2509aabd91e4e3 100644
--- a/Source/core/rendering/shapes/Shape.cpp
+++ b/Source/core/rendering/shapes/Shape.cpp
@@ -107,7 +107,7 @@ PassOwnPtr<Shape> Shape::createShape(const BasicShape* basicShape, const LayoutS
     switch (basicShape->type()) {
 
     case BasicShape::BasicShapeCircleType: {
-        const BasicShapeCircle* circle = static_cast<const BasicShapeCircle*>(basicShape);
+        const BasicShapeCircle* circle = toBasicShapeCircle(basicShape);
         FloatPoint center = floatPointForCenterCoordinate(circle->centerX(), circle->centerY(), FloatSize(boxWidth, boxHeight));
         float radius = circle->floatValueForRadiusInBox(FloatSize(boxWidth, boxHeight));
         FloatPoint logicalCenter = physicalPointToLogical(center, logicalBoxSize.height().toFloat(), writingMode);
@@ -117,7 +117,7 @@ PassOwnPtr<Shape> Shape::createShape(const BasicShape* basicShape, const LayoutS
     }
 
     case BasicShape::BasicShapeEllipseType: {
-        const BasicShapeEllipse* ellipse = static_cast<const BasicShapeEllipse*>(basicShape);
+        const BasicShapeEllipse* ellipse = toBasicShapeEllipse(basicShape);
         FloatPoint center = floatPointForCenterCoordinate(ellipse->centerX(), ellipse->centerY(), FloatSize(boxWidth, boxHeight));
         float radiusX = ellipse->floatValueForRadiusInBox(ellipse->radiusX(), center.x(), boxWidth);
         float radiusY = ellipse->floatValueForRadiusInBox(ellipse->radiusY(), center.y(), boxHeight);
@@ -128,7 +128,7 @@ PassOwnPtr<Shape> Shape::createShape(const BasicShape* basicShape, const LayoutS
     }
 
     case BasicShape::BasicShapePolygonType: {
-        const BasicShapePolygon* polygon = static_cast<const BasicShapePolygon*>(basicShape);
+        const BasicShapePolygon* polygon = toBasicShapePolygon(basicShape);
         const Vector<Length>& values = polygon->values();
         size_t valuesSize = values.size();
         ASSERT(!(valuesSize % 2));
@@ -144,7 +144,7 @@ PassOwnPtr<Shape> Shape::createShape(const BasicShape* basicShape, const LayoutS
     }
 
     case BasicShape::BasicShapeInsetType: {
-        const BasicShapeInset& inset = *static_cast<const BasicShapeInset*>(basicShape);
+        const BasicShapeInset& inset = *toBasicShapeInset(basicShape);
         float left = floatValueForLength(inset.left(), boxWidth);
         float top = floatValueForLength(inset.top(), boxHeight);
         float right = floatValueForLength(inset.right(), boxWidth);