SDK fixes

tool/input_sdk/lib/internal/iterable.dart

Index: tool/input_sdk/lib/internal/iterable.dart
diff --git a/tool/input_sdk/lib/internal/iterable.dart b/tool/input_sdk/lib/internal/iterable.dart
index a5c2519092d702ff6a2d1b1e4060ab5063fe993f..0262927a192464c63fddc13fd7d6adcc9a465b85 100644
--- a/tool/input_sdk/lib/internal/iterable.dart
+++ b/tool/input_sdk/lib/internal/iterable.dart
@@ -740,9 +740,9 @@ class EmptyIterable<E> extends IterableBase<E> implements EfficientLength {
 
   Iterable<E> takeWhile(bool test(E element)) => this;
 
-  List toList({ bool growable: true }) => growable ? <E>[] : new List<E>(0);
+  List<E> toList({ bool growable: true }) => growable ? <E>[] : new List<E>(0);
 
-  Set toSet() => new Set<E>();
+  Set<E> toSet() => new Set<E>();
 }
 
 /** The always empty iterator. */