Update collection (list / map / iterable) printing.

tool/input_sdk/lib/collection/set.dart

Index: tool/input_sdk/lib/collection/set.dart
diff --git a/tool/input_sdk/lib/collection/set.dart b/tool/input_sdk/lib/collection/set.dart
index f2a4aa11da0e2f9d3364e970e16d2c4352c4ae2a..499225dca2b1f9fa40493e9091ca2571e671c4e1 100644
--- a/tool/input_sdk/lib/collection/set.dart
+++ b/tool/input_sdk/lib/collection/set.dart
@@ -158,7 +158,7 @@ abstract class SetMixin<E> implements Set<E> {
   }
 
   dynamic/*=T*/ fold/*<T>*/(var/*=T*/ initialValue,
-               dynamic/*=T*/ combine(var/*=T*/ previousValue, E element)) {
+      dynamic/*=T*/ combine(var/*=T*/ previousValue, E element)) {
     var value = initialValue;
     for (E element in this) value = combine(value, element);
     return value;