Fix up constructor naming style for MaskFilter and ColorFilter.

sky/examples/raw/painting.sky

Index: sky/examples/raw/painting.sky
diff --git a/sky/examples/raw/painting.sky b/sky/examples/raw/painting.sky
index feb702c813ab54b8542f851eb6a4fe969f3161df..9e5cc50123e930afeac3609bd6613b6328058f93 100644
--- a/sky/examples/raw/painting.sky
+++ b/sky/examples/raw/painting.sky
@@ -56,10 +56,10 @@ void main() {
             (Paint layerPaint) {
           layerPaint.color = const Color.fromARGB(128, 255, 255, 0);
           layerPaint.setColorFilter(
-              new ColorFilter.Mode(const Color.fromARGB(128, 0, 0, 255),
+              new ColorFilter.mode(const Color.fromARGB(128, 0, 0, 255),
                                    TransferMode.srcInMode));
           layerPaint.setMaskFilter(
-              new MaskFilter.Blur(BlurStyle.normal, 3.0, highQuality: true));
+              new MaskFilter.blur(BlurStyle.normal, 3.0, highQuality: true));
         })
         ..addLayerOnTop(
             new DrawLooperLayerInfo()