Support shelf 0.7.0.

test/runner/browser/internet_explorer_test.dart

Index: test/runner/browser/internet_explorer_test.dart
diff --git a/test/runner/browser/internet_explorer_test.dart b/test/runner/browser/internet_explorer_test.dart
index f363f4436501231b17a23c2abef3363297176bf1..994832f25ee08984b36ee6081d4d4b2ab023d12d 100644
--- a/test/runner/browser/internet_explorer_test.dart
+++ b/test/runner/browser/internet_explorer_test.dart
@@ -34,7 +34,7 @@ webSocket.addEventListener("open", function() {
     var webSocket = server.handleWebSocket();
 
     schedule(() async {
-      expect(await (await webSocket).first, equals("loaded!"));
+      expect(await (await webSocket).stream.first, equals("loaded!"));
     });
   });