Fix an analyzer error in http and barback.

pkg/barback/lib/src/utils.dart

Index: pkg/barback/lib/src/utils.dart
diff --git a/pkg/barback/lib/src/utils.dart b/pkg/barback/lib/src/utils.dart
index ad97460c54facd74633c1d944eb7fc8c35002f98..95f69e86064189581a0fc075d3aebb1b6e6ca43e 100644
--- a/pkg/barback/lib/src/utils.dart
+++ b/pkg/barback/lib/src/utils.dart
@@ -85,7 +85,9 @@ String byteToHex(int byte) {
 /// If [input] is a [TypedData], this just returns a view on [input].
 Uint8List toUint8List(List<int> input) {
   if (input is Uint8List) return input;
-  if (input is TypedData) return new Uint8List.view(input.buffer);
+  if (input is TypedData) {
+    return new Uint8List.view((input as TypedData).buffer);

[Bob Nystrom, 2013/11/16 00:59:16]

I thought the analyzer was supposed to allow this with the new type guard stuff.
Can you check with Brian and see what's going on here? Until then, add a TODO to
remove the "as" when the analyzer is smarter.

[nweiz, 2013/11/16 01:12:50]

Done.

+  }
   return new Uint8List.fromList(input);
 }