Change singleSubscription/multiSubscription to normal/broadcast.

utils/pub/error_group.dart

Index: utils/pub/error_group.dart
diff --git a/utils/pub/error_group.dart b/utils/pub/error_group.dart
index a9f78617f7be0b9d7e1c5ecee3f4fa568c9ec11e..b78ceacb77f11e6c20ef24c5ab14fdee71bf622f 100644
--- a/utils/pub/error_group.dart
+++ b/utils/pub/error_group.dart
@@ -233,9 +233,9 @@ class _ErrorGroupStream extends Stream {
   /// Creates a new [_ErrorGroupFuture] that's a child of [_group] and wraps
   /// [inner].
   _ErrorGroupStream(this._group, Stream inner)
-    : _controller = inner.isSingleSubscription ?
-          new StreamController() :
-          new StreamController.multiSubscription() {
+    : _controller = inner.isBroadcast ?
+          new StreamController.broadcast() :
+          new StreamController() {
     _subscription = inner.listen(_controller.add,
         onError: (e) => _group._signalError(e),
         onDone: () {