Give ParentDataNodes snappier names

sky/examples/stocks2/lib/stock_row.dart

Index: sky/examples/stocks2/lib/stock_row.dart
diff --git a/sky/examples/stocks2/lib/stock_row.dart b/sky/examples/stocks2/lib/stock_row.dart
index e9591622c0ab693eb31e9be8f57167586aa52644..32f1c81fe799b937405598108a327bfd04cb7a84 100644
--- a/sky/examples/stocks2/lib/stock_row.dart
+++ b/sky/examples/stocks2/lib/stock_row.dart
@@ -29,12 +29,12 @@ class StockRow extends Component {
       new Container(
           child: new StockArrow(percentChange: stock.percentChange),
           margin: const EdgeDims.only(right: 5.0)),
-      new FlexExpandingChild(new Text(stock.symbol), flex: 2, key: "symbol"),
+      new Flexible(child: new Text(stock.symbol), flex: 2, key: "symbol"),
       // TODO(hansmuller): text-align: right
-      new FlexExpandingChild(new Text(lastSale,
+      new Flexible(child: new Text(lastSale,
             style: const TextStyle(textAlign: TextAlign.right)),
           key: "lastSale"),
-      new FlexExpandingChild(new Text(changeInPrice,
+      new Flexible(child: new Text(changeInPrice,
           style: typography.black.caption.copyWith(textAlign: TextAlign.right)),
         key: "changeInPrice")
     ];