Fix bug in r13232

runtime/bin/http_impl.dart

Index: runtime/bin/http_impl.dart
diff --git a/runtime/bin/http_impl.dart b/runtime/bin/http_impl.dart
index 503067c98df362c1c0f2d4ceb928285f6a7a7437..93af13b1fc86feef46e4bef71d88f326d1754821 100644
--- a/runtime/bin/http_impl.dart
+++ b/runtime/bin/http_impl.dart
@@ -2101,7 +2101,7 @@ class _HttpClient implements HttpClient {
                              Uri uri,
                              [_HttpClientConnection connection]) {
     if (_shutdown) throw new HttpException("HttpClient shutdown");
-    if (method == null || uri.domain.isEmpty() == null) {
+    if (method == null || uri.domain.isEmpty()) {
       throw new ArgumentError(null);
     }
     return _prepareHttpClientConnection(method, uri, connection);