unfork DDC's copy of most SDK libraries

sdk/lib/async/stream_impl.dart

Index: sdk/lib/async/stream_impl.dart
diff --git a/sdk/lib/async/stream_impl.dart b/sdk/lib/async/stream_impl.dart
index 29cfbd1c3ce5cc1055f0f5240734352e7be9b7d3..c1cffd5b8c5800f2a18d4f5f2cc60676a3e014cf 100644
--- a/sdk/lib/async/stream_impl.dart
+++ b/sdk/lib/async/stream_impl.dart
@@ -144,9 +144,7 @@ class _BufferingStreamSubscription<T> implements StreamSubscription<T>,
 
   void onError(Function handleError) {
     if (handleError == null) handleError = _nullErrorHandler;
-    // We are not allowed to use 'void' as type argument for the generic type,
-    // so we use 'dynamic' instead.
-    _onError = _registerErrorHandler<dynamic>(handleError, _zone);
+    _onError = _registerErrorHandler(handleError, _zone);
   }
 
   void onDone(void handleDone()) {
@@ -1008,7 +1006,7 @@ class _StreamIterator<T> implements StreamIterator<T> {
   }
 
   Future cancel() {
-    StreamSubscription<T> subscription = _subscription;
+    StreamSubscription subscription = _subscription;
     Object stateData = _stateData;
     _stateData = null;
     if (subscription != null) {