Fix up constructor naming style for MaskFilter and ColorFilter.

sky/examples/raw/shadow.dart

Index: sky/examples/raw/shadow.dart
diff --git a/sky/examples/raw/shadow.dart b/sky/examples/raw/shadow.dart
index a127cfb2a2bd36c8008d40780051abf209c7a868..32c401aba51256ac3228d27216187ec925740ea9 100644
--- a/sky/examples/raw/shadow.dart
+++ b/sky/examples/raw/shadow.dart
@@ -21,7 +21,7 @@ void beginFrame(double timeStamp) {
         (Paint layerPaint) {
       layerPaint.color = const Color.fromARGB(128, 55, 55, 55);
       layerPaint.setMaskFilter(
-          new MaskFilter.Blur(BlurStyle.normal, 5.0, highQuality: true));
+          new MaskFilter.blur(BlurStyle.normal, 5.0, highQuality: true));
     })
     // Main layer.
     ..addLayerOnTop(new DrawLooperLayerInfo(), (Paint) {});