Temporarily disable TouchList constructor to implement varargs.

sdk/lib/html/dart2js/html_dart2js.dart

Index: sdk/lib/html/dart2js/html_dart2js.dart
diff --git a/sdk/lib/html/dart2js/html_dart2js.dart b/sdk/lib/html/dart2js/html_dart2js.dart
index a29ec0fbaf292cddf09dcc0bfead8072946a2305..293f66ac2c067a1d71584860b046005ff97dd98c 100644
--- a/sdk/lib/html/dart2js/html_dart2js.dart
+++ b/sdk/lib/html/dart2js/html_dart2js.dart
@@ -23716,7 +23716,8 @@ class TouchList extends Interceptor with ListMixin<Touch>, ImmutableListMixin<To
   /// NB: This constructor likely does not work as you might expect it to! This
   /// constructor will simply fail (returning null) if you are not on a device
   /// with touch enabled. See dartbug.com/8314.
-  factory TouchList() => document._createTouchList();
+  // TODO(5760): createTouchList now uses varargs.
+  factory TouchList() => null;//document._createTouchList();
   // To suppress missing implicit constructor warnings.
   factory TouchList._() { throw new UnsupportedError("Not supported"); }