Update dart2js to fix #80.

test/kernel/regression/issue_000080.dart

Index: test/kernel/regression/issue_000080.dart
diff --git a/test/kernel/regression/duplicated_mixin.dart b/test/kernel/regression/issue_000080.dart
similarity index 59%
copy from test/kernel/regression/duplicated_mixin.dart
copy to test/kernel/regression/issue_000080.dart
index 08368cfe449dab0e4c25587c302575b44ea83f57..6a0292d34c7885ccaa3fa5863e2935248d206651 100644
--- a/test/kernel/regression/duplicated_mixin.dart
+++ b/test/kernel/regression/issue_000080.dart
@@ -4,7 +4,16 @@
 
 class Mixin {
   var field;
+  foo() => 87;
 }
 
-class A extends Object with Mixin, Mixin {
+class Foo extends Object with Mixin {
+  foo() => super.foo();
+  bar() => super.field;
+}
+
+main() {
+  var f = new Foo();
+  f.field = 42;
+  print(f.bar());
 }