Update pkg/http to use the new async APIs.

pkg/http/test/utils.dart

Index: pkg/http/test/utils.dart
diff --git a/pkg/http/test/utils.dart b/pkg/http/test/utils.dart
index 9e9ae8b3408d37c5ab724bd4f8486fe0f41f3f18..53ff769bbf68a1a16a3a2ab3250cbbf85e75e074 100644
--- a/pkg/http/test/utils.dart
+++ b/pkg/http/test/utils.dart
@@ -4,6 +4,7 @@
 
 library test_utils;
 
+import 'dart:async';
 import 'dart:io';
 import 'dart:json' as json;
 import 'dart:uri';
@@ -104,6 +105,11 @@ void stopServer() {
   _server = null;
 }
 
+// TODO(nweiz): remove this once issue 7785 is fixed.
+/// Buffers all input from an InputStream and returns it as a future.
+Future<List<int>> consumeInputStream(InputStream stream) =>
+  new http.ByteStream(wrapInputStream(stream)).toBytes();
+
 /// A matcher that matches JSON that parses to a value that matches the inner
 /// matcher.
 Matcher parse(matcher) => new _Parse(matcher);