Ensure that stack traces are propagated more often in dart:io.

sdk/lib/io/http_parser.dart

Index: sdk/lib/io/http_parser.dart
diff --git a/sdk/lib/io/http_parser.dart b/sdk/lib/io/http_parser.dart
index d941aa40b63deef9958a9596286b596d2d55188b..09f06eaee38b5cff19d0d0095850d4c2a9ac0ddc 100644
--- a/sdk/lib/io/http_parser.dart
+++ b/sdk/lib/io/http_parser.dart
@@ -321,7 +321,7 @@ class _HttpParser extends Stream<_HttpIncoming> {
     // how the _HttpIncoming signals the parser.
     _socketSubscription = stream.listen(
         _onData,
-        onError: _onError,
+        onError: _controller.addError,
         onDone: _onDone);
   }
 
@@ -845,10 +845,6 @@ class _HttpParser extends Stream<_HttpIncoming> {
     _controller.close();
   }
 
-  void _onError(e, [StackTrace stackTrace]) {
-    _controller.addError(e, stackTrace);
-  }
-
   String get version {
     switch (_httpVersion) {
       case _HttpVersion.HTTP10: