Replace setBoxDecoration() with a decoration property. (part II)

sky/examples/raw/sector-layout.dart

Index: sky/examples/raw/sector-layout.dart
diff --git a/sky/examples/raw/sector-layout.dart b/sky/examples/raw/sector-layout.dart
index f296f38fce16d3d82677f9ffb9af48b192160aee..825663843c8cb1cbc492529ad7b678baf5c95842 100644
--- a/sky/examples/raw/sector-layout.dart
+++ b/sky/examples/raw/sector-layout.dart
@@ -98,10 +98,12 @@ class RenderDecoratedSector extends RenderSector {
 
   RenderDecoratedSector(BoxDecoration decoration) : _decoration = decoration;
 
-  void setBoxDecoration(BoxDecoration decoration) {
-    if (_decoration == decoration)
+  BoxDecoration _decoration;
+  BoxDecoration get decoration => _decoration;
+  void set decoration (BoxDecoration value) {
+    if (value == _decoration)
       return;
-    _decoration = decoration;
+    _decoration = value;
     markNeedsPaint();
   }