Use dart.tearoff helper at tearoff sites

test/codegen/expect/methods.js

Index: test/codegen/expect/methods.js
diff --git a/test/codegen/expect/methods.js b/test/codegen/expect/methods.js
index b379e950dff2a0a3f888de2336b2a4d31401ba6a..e02c256c9e2e0e110f3878ffd373528da1ac3e4f 100644
--- a/test/codegen/expect/methods.js
+++ b/test/codegen/expect/methods.js
@@ -70,7 +70,7 @@ var core = dart.import(core);
     let f = new Foo();
     dart.dcall(f.bar, "Bar's call method!");
     let a = new A();
-    let g = a.x.bind(a);
+    let g = dart.tearoff(a, 'x');
     let aa = new A();
     let h = dart.dload(aa, 'x');
   }